Search Results

There are 98 CVE Records that match your search.
Name Description
CVE-2022-47408 An issue was discovered in the fp_newsletter (aka Newsletter subscriber management) extension before 1.1.1, 1.2.0, 2.x before 2.1.2, 2.2.1 through 2.4.0, and 3.x before 3.2.6 for TYPO3. There is a CAPTCHA bypass that can lead to subscribing many people.
CVE-2022-4120 The Stop Spammers Security | Block Spam Users, Comments, Forms WordPress plugin before 2022.6 passes base64 encoded user input to the unserialize() PHP function when CAPTCHA are used as second challenge, which could lead to PHP Object injection if a plugin installed on the blog has a suitable gadget chain
CVE-2022-4036 The Appointment Hour Booking plugin for WordPress is vulnerable to CAPTCHA bypass in versions up to, and including, 1.3.72. This is due to the use of insufficiently strong hashing algorithm on the CAPTCHA secret that is also displayed to the user via a cookie.
CVE-2022-37411 Cross-Site Request Forgery (CSRF) vulnerability in Vinoj Cardoza's Captcha Code plugin <= 2.7 at WordPress.
CVE-2022-34983 The scu-captcha package in PyPI v0.0.1 to v0.0.4 included a code execution backdoor inserted by a third party.
CVE-2022-2913 The Login No Captcha reCAPTCHA WordPress plugin before 1.7 doesn't check the proper IP address allowing attackers to spoof IP addresses on the allow list and bypass the need for captcha on the login screen.
CVE-2022-24880 flask-session-captcha is a package which allows users to extend Flask by adding an image based captcha stored in a server side session. In versions prior to 1.2.1, he `captcha.validate()` function would return `None` if passed no value (e.g. by submitting an having an empty form). If implementing users were checking the return value to be **False**, the captcha verification check could be bypassed. Version 1.2.1 fixes the issue. Users can workaround the issue by not explicitly checking that the value is False. Checking the return value less explicitly should still work.
CVE-2022-2187 The Contact Form 7 Captcha WordPress plugin before 0.1.2 does not escape the $_SERVER['REQUEST_URI'] parameter before outputting it back in an attribute, which could lead to Reflected Cross-Site Scripting in old web browsers
CVE-2022-2184 The CAPTCHA 4WP WordPress plugin before 7.1.0 lets user input reach a sensitive require_once call in one of its admin-side templates. This can be abused by attackers, via a Cross-Site Request Forgery attack to run arbitrary code on the server.
CVE-2022-1801 The Very Simple Contact Form WordPress plugin before 11.6 exposes the solution to the captcha in the rendered contact form, both as hidden input fields and as plain text in the page, making it very easy for bots to bypass the captcha check, rendering the page a likely target for spam bots.
CVE-2022-1265 The BulletProof Security WordPress plugin before 6.1 does not sanitize and escape some of its CAPTCHA settings, which could allow high-privileged users to perform Cross-Site Scripting attacks even when unfiltered_html is disallowed
CVE-2021-43958 Various rest resources in Fisheye and Crucible before version 4.8.9 allowed remote attackers to brute force user login credentials as rest resources did not check if users were beyond their max failed login limits and therefore required solving a CAPTCHA in addition to providing user credentials for authentication via a improper restriction of excess authentication attempts vulnerability.
CVE-2021-42358 The Contact Form With Captcha WordPress plugin is vulnerable to Cross-Site Request Forgery due to missing nonce validation in the ~/cfwc-form.php file during contact form submission, which made it possible for attackers to inject arbitrary web scripts in versions up to, and including 1.6.2.
CVE-2021-41435 A brute-force protection bypass in CAPTCHA protection in ASUS ROG Rapture GT-AX11000, RT-AX3000, RT-AX55, RT-AX56U, RT-AX56U_V2, RT-AX58U, RT-AX82U, RT-AX82U GUNDAM EDITION, RT-AX86 Series(RT-AX86U/RT-AX86S), RT-AX86U ZAKU II EDITION, RT-AX88U, RT-AX92U, TUF Gaming AX3000, TUF Gaming AX5400 (TUF-AX5400), ASUS ZenWiFi XD6, ASUS ZenWiFi AX (XT8) before 3.0.0.4.386.45898, and RT-AX68U before 3.0.0.4.386.45911, allows a remote attacker to attempt any number of login attempts via sending a specific HTTP request.
CVE-2021-39412 Multiple Cross Site Scripting (XSS) vulnerabilities exists in PHPGurukul Shopping v3.1 via the (1) callback parameter in (a) server_side/scripts/id_jsonp.php, (b) server_side/scripts/jsonp.php, and (c) scripts/objects_jsonp.php, the (2) value parameter in examples_support/editable_ajax.php, and the (3) PHP_SELF parameter in captcha/index.php.
CVE-2021-37417 Zoho ManageEngine ADSelfService Plus version 6103 and prior allows CAPTCHA bypass due to improper parameter validation.
CVE-2021-29047 The SimpleCaptcha implementation in Liferay Portal 7.3.4, 7.3.5 and Liferay DXP 7.3 before fix pack 1 does not invalidate CAPTCHA answers after it is used, which allows remote attackers to repeatedly perform actions protected by a CAPTCHA challenge by reusing the same CAPTCHA answer.
CVE-2021-24565 The Contact Form 7 Captcha WordPress plugin before 0.0.9 does not have any CSRF check in place when saving its settings, allowing attacker to make a logged in user with the manage_options change them. Furthermore, the settings are not escaped when output in attributes, leading to a Stored Cross-Site Scripting issue.
CVE-2021-24124 Unvalidated input and lack of output encoding in the WP Shieldon WordPress plugin, version 1.6.3 and below, leads to Unauthenticated Reflected Cross-Site Scripting (XSS) when the CAPTCHA page is shown could lead to privileged escalation.
CVE-2020-25414 A local file inclusion vulnerability was discovered in the captcha function in Monstra 3.0.4 which allows remote attackers to execute arbitrary PHP code.
CVE-2020-25367 A command injection vulnerability was discovered in the HNAP1 protocol in D-Link DIR-823G devices with firmware V1.0.2B05. An attacker is able to execute arbitrary web scripts via shell metacharacters in the Captcha field to Login.
CVE-2020-21865 ThinkPHP50-CMS v1.0 contains a remote code execution (RCE) vulnerability in the component /public/?s=captcha.
CVE-2020-15514 The jh_captcha extension through 2.1.3, and 3.x through 3.0.2, for TYPO3 allows XSS.
CVE-2019-6588 In Liferay Portal before 7.1 CE GA4, an XSS vulnerability exists in the SimpleCaptcha API when custom code passes unsanitized input into the "url" parameter of the JSP taglib call <liferay-ui:captcha url="<%= url %>" /> or <liferay-captcha:captcha url="<%= url %>" />. Liferay Portal out-of-the-box behavior with no customizations is not vulnerable.
CVE-2019-19825 On certain TOTOLINK Realtek SDK based routers, the CAPTCHA text can be retrieved via an {"topicurl":"setting/getSanvas"} POST to the boafrm/formLogin URI, leading to a CAPTCHA bypass. (Also, the CAPTCHA text is not needed once the attacker has determined valid credentials. The attacker can perform router actions via HTTP requests with Basic Authentication.) This affects A3002RU through 2.0.0, A702R through 2.1.3, N301RT through 2.1.6, N302R through 3.4.0, N300RT through 3.4.0, N200RE through 4.0.0, N150RT through 3.4.0, and N100RE through 3.4.0.
CVE-2019-17525 The login page on D-Link DIR-615 T1 20.10 devices allows remote attackers to bypass the CAPTCHA protection mechanism and conduct brute-force attacks.
CVE-2019-16699 The sr_freecap (aka freeCap CAPTCHA) extension 2.4.5 and below and 2.5.2 and below for TYPO3 fails to sanitize user input, which allows execution of arbitrary Extbase actions, resulting in Remote Code Execution.
CVE-2019-15987 A vulnerability in web interface of the Cisco Webex Event Center, Cisco Webex Meeting Center, Cisco Webex Support Center, and Cisco Webex Training Center could allow an unauthenticated, remote attacker to guess account usernames. The vulnerability is due to missing CAPTCHA protection in certain URLs. An attacker could exploit this vulnerability by sending a crafted request to the web interface. A successful exploit could allow the attacker to know if a given username is valid and find the real name of the user.
CVE-2019-13983 Directus 7 API before 2.2.2 has insufficient anti-automation, as demonstrated by lack of a CAPTCHA in core/Directus/Services/AuthService.php and endpoints/Auth.php.
CVE-2019-13190 In Knowage through 6.1.1, the sign up page does not invalidate a valid CAPTCHA token. This allows for CAPTCHA bypass in the signup page.
CVE-2018-20988 The wpgform plugin before 0.94 for WordPress has eval injection in the CAPTCHA calculation.
CVE-2018-18531 text/impl/DefaultTextCreator.java, text/impl/ChineseTextProducer.java, and text/impl/FiveLetterFirstNameTextCreator.java in kaptcha 2.3.2 use the Random (rather than SecureRandom) function for generating CAPTCHA values, which makes it easier for remote attackers to bypass intended access restrictions via a brute-force approach.
CVE-2018-16979 Monstra CMS V3.0.4 allows HTTP header injection in the plugins/captcha/crypt/cryptographp.php cfg parameter, a related issue to CVE-2012-2943.
CVE-2018-16286 LG SuperSign CMS allows authentication bypass because the CAPTCHA requirement is skipped if a captcha:pass cookie is sent, and because the PIN is limited to four digits.
CVE-2018-15876 An issue was discovered in the ajax-bootmodal-login plugin 1.4.3 for WordPress. The register form, login form, and password-recovery form require solving a CAPTCHA to perform actions. However, this is required only once per user session, and therefore one could send as many requests as one wished by automation.
CVE-2018-13060 Easy!Appointments 1.3.0 has a Guessable CAPTCHA issue.
CVE-2018-12103 An issue was discovered on D-Link DIR-890L with firmware 1.21B02beta01 and earlier, DIR-885L/R with firmware 1.21B03beta01 and earlier, and DIR-895L/R with firmware 1.21B04beta04 and earlier devices (all hardware revisions). Due to the predictability of the /docs/captcha_(number).jpeg URI, being local to the network, but unauthenticated to the administrator's panel, an attacker can disclose the CAPTCHAs used by the access point and can elect to load the CAPTCHA of their choosing, leading to unauthorized login attempts to the access point.
CVE-2017-9091 /admin/loginc.php in Allen Disk 1.6 doesn't check if isset($_SESSION['captcha']['code']) == 1, which leads to CAPTCHA bypass by emptying $_POST['captcha'].
CVE-2017-9090 reg.php in Allen Disk 1.6 doesn't check if isset($_SESSION['captcha']['code'])==1, which makes it possible to bypass the CAPTCHA via an empty $_POST['captcha'].
CVE-2017-7673 Apache OpenMeetings 1.0.0 uses not very strong cryptographic storage, captcha is not used in registration and forget password dialogs and auth forms missing brute force protection.
CVE-2017-2171 Cross-site scripting vulnerability in Captcha prior to version 4.3.0, Car Rental prior to version 1.0.5, Contact Form Multi prior to version 1.2.1, Contact Form prior to version 4.0.6, Contact Form to DB prior to version 1.5.7, Custom Admin Page prior to version 0.1.2, Custom Fields Search prior to version 1.3.2, Custom Search prior to version 1.36, Donate prior to version 2.1.1, Email Queue prior to version 1.1.2, Error Log Viewer prior to version 1.0.6, Facebook Button prior to version 2.54, Featured Posts prior to version 1.0.1, Gallery Categories prior to version 1.0.9, Gallery prior to version 4.5.0, Google +1 prior to version 1.3.4, Google AdSense prior to version 1.44, Google Analytics prior to version 1.7.1, Google Captcha (reCAPTCHA) prior to version 1.28, Google Maps prior to version 1.3.6, Google Shortlink prior to version 1.5.3, Google Sitemap prior to version 3.0.8, Htaccess prior to version 1.7.6, Job Board prior to version 1.1.3, Latest Posts prior to version 0.3, Limit Attempts prior to version 1.1.8, LinkedIn prior to version 1.0.5, Multilanguage prior to version 1.2.2, PDF & Print prior to version 1.9.4, Pagination prior to version 1.0.7, Pinterest prior to version 1.0.5, Popular Posts prior to version 1.0.5, Portfolio prior to version 2.4, Post to CSV prior to version 1.3.1, Profile Extra prior to version 1.0.7. PromoBar prior to version 1.1.1, Quotes and Tips prior to version 1.32, Re-attacher prior to version 1.0.9, Realty prior to version 1.1.0, Relevant - Related Posts prior to version 1.2.0, Sender prior to version 1.2.1, SMTP prior to version 1.1.0, Social Buttons Pack prior to version 1.1.1, Subscriber prior to version 1.3.5, Testimonials prior to version 0.1.9, Timesheet prior to version 0.1.5, Twitter Button prior to version 2.55, User Role prior to version 1.5.6, Updater prior to version 1.35, Visitors Online prior to version 1.0.0, and Zendesk Help Center prior to version 1.0.5 allows remote attackers to inject arbitrary web script or HTML via the function to display the BestWebSoft menu.
CVE-2017-2150 Directory traversal vulnerability in Booking Calendar version 7.0 and earlier allows remote attackers to read arbitrary files via specially crafted captcha_chalange parameter.
CVE-2017-11717 MetInfo through 5.3.17 accepts the same CAPTCHA response for 120 seconds, which makes it easier for remote attackers to bypass intended challenge requirements by modifying the client-server data stream, as demonstrated by the login/findpass page.
CVE-2016-8600 In dotCMS 3.2.1, attacker can load captcha once, fill it with correct value and then this correct value is ok for forms with captcha check later.
CVE-2016-6563 Processing malformed SOAP messages when performing the HNAP Login action causes a buffer overflow in the stack in some D-Link DIR routers. The vulnerable XML fields within the SOAP body are: Action, Username, LoginPassword, and Captcha. The following products are affected: DIR-823, DIR-822, DIR-818L(W), DIR-895L, DIR-890L, DIR-885L, DIR-880L, DIR-868L, and DIR-850L.
CVE-2016-1000032 TGCaptcha2 version 0.3.0 is vulnerable to a replay attack due to a missing nonce allowing attackers to use a single solved CAPTCHA multiple times.
CVE-2015-9444 The altos-connect plugin 1.3.0 for WordPress has XSS via the wp-content/plugins/altos-connect/jquery-validate/demo/demo/captcha/index.php/ PATH_SELF.
CVE-2015-8351 PHP remote file inclusion vulnerability in the Gwolle Guestbook plugin before 1.5.4 for WordPress, when allow_url_include is enabled, allows remote authenticated users to execute arbitrary PHP code via a URL in the abspath parameter to frontend/captcha/ajaxresponse.php. NOTE: this can also be leveraged to include and execute arbitrary local files via directory traversal sequences regardless of whether allow_url_include is enabled.
CVE-2015-6250 simple-php-captcha before commit 9d65a945029c7be7bb6bc893759e74c5636be694 allows remote attackers to automatically generate the captcha response by running the same code on the client-side.
CVE-2015-0890 The BestWebSoft Google Captcha (aka reCAPTCHA) plugin before 1.13 for WordPress allows remote attackers to bypass the CAPTCHA protection mechanism and obtain administrative access via unspecified vectors.
CVE-2014-9624 CAPTCHA bypass vulnerability in MantisBT before 1.2.19.
CVE-2014-9283 The BestWebSoft Captcha plugin before 4.0.7 for WordPress allows remote attackers to bypass the CAPTCHA protection mechanism and obtain administrative access via unspecified vectors.
CVE-2014-9117 MantisBT before 1.2.18 uses the public_key parameter value as the key to the CAPTCHA answer, which allows remote attackers to bypass the CAPTCHA protection mechanism by leveraging knowledge of a CAPTCHA answer for a public_key parameter value, as demonstrated by E4652 for the public_key value 0.
CVE-2014-8365 Multiple cross-site scripting (XSS) vulnerabilities in Xornic Contact Us allow remote attackers to inject arbitrary web script or HTML via the (1) name or (2) email parameter to contact.php or (3) PATH_INFO to setup.php, related to the "PHP_SELF" variable.
CVE-2014-8034 Cisco WebEx Meetings Server 1.5 presents the same CAPTCHA challenge for each login attempt, which makes it easier for remote attackers to obtain access via a brute-force approach of guessing usernames, aka Bug ID CSCuj40321.
CVE-2014-6288 The powermail extension 2.x before 2.0.11 for TYPO3 allows remote attackers to bypass the CAPTCHA protection mechanism via unspecified vectors.
CVE-2014-6050 phpMyFAQ before 2.8.13 allows remote attackers to bypass the CAPTCHA protection mechanism by replaying the request.
CVE-2014-5190 Cross-site scripting (XSS) vulnerability in captcha-secureimage/test/index.php in the SI CAPTCHA Anti-Spam plugin 2.7.4 for WordPress allows remote attackers to inject arbitrary web script or HTML via the PATH_INFO.
CVE-2014-2265 Rock Lobster Contact Form 7 before 3.7.2 allows remote attackers to bypass the CAPTCHA protection mechanism and submit arbitrary form data by omitting the _wpcf7_captcha_challenge_captcha-719 parameter.
CVE-2014-2224 Plogger 1.0 RC1 and earlier, when the Lucid theme is used, does not assign new values for certain codes, which makes it easier for remote attackers to bypass the CAPTCHA protection mechanism via a series of form submissions.
CVE-2013-6672 Mozilla Firefox before 26.0 and SeaMonkey before 2.23 on Linux allow user-assisted remote attackers to read clipboard data by leveraging certain middle-click paste operations.
CVE-2013-6246 The Dell Quest One Password Manager, possibly 5.0, allows remote attackers to bypass CAPTCHA protections and obtain sensitive information (user's full name) by sending a login request with a valid domain and username but without the CaptchaType, UseCaptchaEveryTime, and CaptchaResponse parameters.
CVE-2013-4982 AVTECH AVN801 DVR has a security bypass via the administration login captcha
CVE-2013-4680 Open redirect vulnerability in Maag Form Captcha extension 2.0.0 and earlier for TYPO3 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via unspecified vectors.
CVE-2013-3535 Multiple cross-site scripting (XSS) vulnerabilities in CMSLogik 1.2.0 and 1.2.1 allow remote attackers to inject arbitrary web script or HTML via the (1) admin_email, (2) header_title, (3) site_title parameter to admin/settings; (4) recaptcha_private or (5) recaptcha_public parameter to admin/captcha_settings; (6) fb_appid, (7) fp_secret, (8) tw_consumer_key, or (9) tw_consumer_secret parameter to admin/social_settings; (10) slug parameter to admin/gallery/save_item_settings; or (11) item_link parameter to admin/edit_menu_item_ajax. NOTE: this issue might be resultant from CSRF.
CVE-2012-2914 Cross-site scripting (XSS) vulnerability in captchademo.php in Unijimpe Captcha allows remote attackers to inject arbitrary web script or HTML via the PATH_INFO.
CVE-2012-2436 Multiple cross-site scripting (XSS) vulnerabilities in Pligg CMS before 1.2.2 allow remote attackers to inject arbitrary web script or HTML via (1) an arbitrary parameter in a move or (2) minimize action to admin/admin_index.php; (3) the karma_username parameter to module.php in the karma module; (4) q_1_low, (5) q_1_high, (6) q_2_low, or (7) q_2_high parameter in a configure action to module.php in the captcha module; or (8) the edit parameter to module.php in the admin_language module.
CVE-2012-2435 Directory traversal vulnerability in the captcha module in Pligg CMS before 1.2.2 allows remote authenticated users to include and execute arbitrary local files via a .. (dot dot) in the captcha parameter to module.php, as demonstrated by cross-site request forgery (CSRF) attacks.
CVE-2012-0872 Multiple cross-site scripting (XSS) vulnerabilities in OxWall 1.1.1 and earlier allow remote attackers to inject arbitrary web script or HTML via the (1) captchaField, (2) email, (3) form_name, (4) password, (5) realname, (6) repeatPassword, or (7) username parameters to Oxwall/join; (8) captcha, (9) email, (10) form_name, (11) from, or (12) subject parameters to Oxwall/contact; (13) tag parameter to Oxwall/blogs/browse-by-tag; or (14) PATH_INFO to Oxwall/photo/viewlist/tagged, (15) Oxwall/photo/viewlist, or (16) Oxwall/video/viewlist.
CVE-2011-3717 ClipBucket 2.0.9 allows remote attackers to obtain sensitive information via a direct request to a .php file, which reveals the installation path in an error message, as demonstrated by plugins/signup_captcha/signup_captcha.php and certain other files.
CVE-2011-0759 Multiple cross-site request forgery (CSRF) vulnerabilities in the configuration page in the Recaptcha (aka WP-reCAPTCHA) plugin 2.9.8.2 for WordPress allow remote attackers to hijack the authentication of administrators for requests that disable the CAPTCHA requirement or insert cross-site scripting (XSS) sequences via the (1) recaptcha_opt_pubkey, (2) recaptcha_opt_privkey, (3) re_tabindex, (4) error_blank, (5) error_incorrect, (6) mailhide_pub, (7) mailhide_priv, (8) mh_replace_link, or (9) mh_replace_title parameter.
CVE-2010-5339 IceWarp Webclient before 10.2.1 has XSS via an HTTP POST request: webmail/basic/ with the parameter _dlg[captcha][uid] is non-persistent in 10.1.3 and 10.2.0.
CVE-2010-5338 IceWarp Webclient before 10.2.1 has XSS via an HTTP POST request: webmail/basic/ with the parameter _dlg[captcha][action] is non-persistent in 10.1.3 and 10.2.0.
CVE-2010-5337 IceWarp Webclient before 10.2.1 has XSS via an HTTP POST request: webmail/basic/ with the parameter _dlg[captcha][controller] is non-persistent in 10.1.3 and 10.2.0.
CVE-2010-3272 accounts/ValidateAnswers in the security-questions implementation in ZOHO ManageEngine ADSelfService Plus before 4.5 Build 4500 makes it easier for remote attackers to reset user passwords, and consequently obtain access to arbitrary user accounts, via a modified (1) Hide_Captcha or (2) quesList parameter in a validateAll action.
CVE-2010-2848 Directory traversal vulnerability in assets/captcha/includes/alikon/playcode.php in the InterJoomla ArtForms (com_artforms) component 2.1b7.2 RC2 for Joomla! allows remote attackers to read arbitrary files via a .. (dot dot) in the l parameter.
CVE-2010-1865 Multiple SQL injection vulnerabilities in ClanSphere 2009.0.3 and earlier allow remote attackers to execute arbitrary SQL commands via (1) the IP address to the cs_getip function in generate.php in the Captcha module, or (2) the s_email parameter to the cs_sql_select function in the MySQL database driver (mysql.php).
CVE-2009-3818 Unspecified vulnerability in the session handling feature in freeCap CAPTCHA (sr_freecap) extension 1.2.0 and earlier for TYPO3 has unknown impact and attack vectors.
CVE-2009-1822 Multiple PHP remote file inclusion vulnerabilities in the InterJoomla ArtForms (com_artforms) component 2.1b7 for Joomla! allow remote attackers to execute arbitrary PHP code via a URL in the mosConfig_absolute_path parameter to (1) imgcaptcha.php or (2) mp3captcha.php in assets/captcha/includes/captchaform/, or (3) assets/captcha/includes/captchatalk/swfmovie.php.
CVE-2009-10001 A vulnerability classified as problematic was found in jianlinwei cool-php-captcha up to 0.2. This vulnerability affects unknown code of the file example-form.php. The manipulation of the argument captcha with the input %3Cscript%3Ealert(1)%3C/script%3E leads to cross site scripting. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 0.3 is able to address this issue. The name of the patch is c84fb6b153bebaf228feee0cbf50728d27ae3f80. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-218296.
CVE-2008-7216 Peter's Math Anti-Spam Spinoff plugin for WordPress generates audio CAPTCHA clips by concatenating static audio files without any additional distortion, which allows remote attackers to bypass CAPTCHA protection by reading certain bytes from the generated clip.
CVE-2008-6172 Directory traversal vulnerability in captcha/captcha_image.php in the RWCards (com_rwcards) 3.0.11 component for Joomla!, when magic_quotes_gpc is disabled, allows remote attackers to include and execute arbitrary local files via directory traversal sequences in the img parameter.
CVE-2008-5995 Cross-site scripting (XSS) vulnerability in the freeCap CAPTCHA (sr_freecap) extension before 1.0.4 for TYPO3 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
CVE-2008-3573 The CAPTCHA implementation in (1) Pligg 9.9.5 and possibly (2) Francisco Burzi PHP-Nuke 8.1 provides a critical random number (the ts_random value) within the URL in the SRC attribute of an IMG element, which allows remote attackers to pass the CAPTCHA test via a calculation that combines this value with the current date and the HTTP User-Agent string.
CVE-2008-2020 The CAPTCHA implementation as used in (1) Francisco Burzi PHP-Nuke 7.0 and 8.1, (2) my123tkShop e-Commerce-Suite (aka 123tkShop) 0.9.1, (3) phpMyBitTorrent 1.2.2, (4) TorrentFlux 2.3, (5) e107 0.7.11, (6) WebZE 0.5.9, (7) Open Media Collectors Database (aka OpenDb) 1.5.0b4, and (8) Labgab 1.1 uses a code_bg.jpg background image and the PHP ImageString function in a way that produces an insufficient number of different images, which allows remote attackers to pass the CAPTCHA test via an automated attack using a table of all possible image checksums and their corresponding digit strings.
CVE-2008-2019 Simple Machines Forum (SMF), probably 1.1.4, relies on "randomly generated static" to hinder brute-force attacks on the WAV file (aka audio) CAPTCHA, which allows remote attackers to pass the CAPTCHA test via an automated attack that considers Hamming distances. NOTE: this issue reportedly exists because of an insufficient fix for CVE-2007-3308.
CVE-2008-0351 admin/config.php in Evilsentinel 1.0.9 and earlier allows remote attackers to bypass the CAPTCHA test by omitting the es_security_captcha parameter and not invoking captcha.php.
CVE-2008-0206 Multiple cross-site scripting (XSS) vulnerabilities in captcha\captcha.php in the Captcha! 2.5d and earlier plugin for WordPress allow remote attackers to inject arbitrary web script or HTML via the (1) captcha_ttffolder, (2) captcha_numchars, (3) captcha_ttfrange, or (4) captcha_secret parameter.
CVE-2007-3309 Unspecified vulnerability in Simple Machines Forum (SMF) 1.1.2 allows remote attackers to execute arbitrary PHP code during (1) creation or (2) editing of a message.
CVE-2007-3308 Simple Machines Forum (SMF) 1.1.2 uses a concatenation method with insufficient randomization when creating a WAV file CAPTCHA, which allows remote attackers to pass the CAPTCHA test via an automated brute-force attack.
CVE-2007-1850 Directory traversal vulnerability in classes/captcha/captcha.jpg.php in Drake CMS allows remote attackers to read arbitrary files or list arbitrary directories, and obtain the installation path, via a .. (dot dot) in the d_private parameter. NOTE: Drake CMS has only a beta version available, and the vendor has previously stated "We do not consider security reports valid until the first official release of Drake CMS."
CVE-2007-1184 The default configuration of WebAPP before 0.9.9.5 has a CAPTCHA setting of "no," which makes it easier for automated programs to submit false data.
CVE-2007-0658 The (1) Textimage 4.7.x before 4.7-1.2 and 5.x before 5.x-1.1 module for Drupal and the (2) Captcha 4.7.x before 4.7-1.2 and 5.x before 5.x-1.1 module for Drupal allow remote attackers to bypass the CAPTCHA test via an empty captcha element in $_SESSION.
CVE-2006-5239 Multiple cross-site scripting (XSS) vulnerabilities in eXpBlog 0.3.5 and earlier allow remote attackers to inject arbitrary web script or HTML via (1) the query string (PHP_SELF) in kalender.php or (2) the captcha_session_code parameter in pre_details.php.
CVE-2006-4272 ** DISPUTED ** Jelsoft vBulletin 3.5.4 allows remote attackers to register multiple arbitrary users and cause a denial of service (resource consumption) via a large number of requests to register.php. NOTE: the vendor has disputed this vulnerability, stating "If you have the CAPTCHA enabled then the registrations wont even go through. ... if you are talking about the flood being allowed in the first place then surely this is something that should be handled at the server level."
CVE-2006-2918 The Lanap BotDetect APS.NET CAPTCHA component before 1.5.4.0 stores the UUID and hash for a CAPTCHA in the ViewState of a page, which makes it easier for remote attackers to conduct automated attacks by "replaying the ViewState for a known number."
CVE-2006-0805 The CAPTCHA functionality in php-Nuke 6.0 through 7.9 uses fixed challenge/response pairs that only vary once per day based on the User Agent (HTTP_USER_AGENT), which allows remote attackers to bypass CAPTCHA controls by fixing the User Agent, performing a valid challenge/response, then replaying that pair in the random_num and gfx_check parameters.
CVE-2005-4163 Directory traversal vulnerability in captcha.php in Captcha PHP 0.9 allows remote attackers to read arbitrary files via the _tcf parameter.
  
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