CVE - CVE-2021-32671

CVE-ID
CVE-2021-32671	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
Flarum is a forum software for building communities. Flarum's translation system allowed for string inputs to be converted into HTML DOM nodes when rendered. This change was made after v0.1.0-beta.16 (our last beta before v1.0.0) and was not noticed or documented. This allowed for any user to type malicious HTML markup within certain user input fields and have this execute on client browsers. The example which led to the discovery of this vulnerability was in the forum search box. Entering faux-malicious HTML markup, such as <script>alert('test')</script> resulted in an alert box appearing on the forum. This attack could also be modified to perform AJAX requests on behalf of a user, possibly deleting discussions, modifying their settings or profile, or even modifying settings on the Admin panel if the attack was targetted towards a privileged user. All Flarum communities that run flarum v1.0.0 or v1.0.1 are impacted. The vulnerability has been fixed and published as flarum/core v1.0.2. All communities running Flarum v1.0 have to upgrade as soon as possible to v1.0.2.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
CONFIRM:https://github.com/flarum/core/security/advisories/GHSA-5qjq-69w6-fg57 URL:https://github.com/flarum/core/security/advisories/GHSA-5qjq-69w6-fg57 MISC:https://github.com/flarum/core/commit/440bed81b8019dff00642c8f493b4909d505a28a URL:https://github.com/flarum/core/commit/440bed81b8019dff00642c8f493b4909d505a28a MISC:https://packagist.org/packages/flarum/core URL:https://packagist.org/packages/flarum/core
Assigning CNA
GitHub (maintainer security advisories)
Date Record Created
20210512	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20210512)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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