CVE - CVE-2020-15118

CVE-ID
CVE-2020-15118	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In Wagtail before versions 2.7.4 and 2.9.3, when a form page type is made available to Wagtail editors through the `wagtail.contrib.forms` app, and the page template is built using Django's standard form rendering helpers such as form.as_p, any HTML tags used within a form field's help text will be rendered unescaped in the page. Allowing HTML within help text is an intentional design decision by Django; however, as a matter of policy Wagtail does not allow editors to insert arbitrary HTML by default, as this could potentially be used to carry out cross-site scripting attacks, including privilege escalation. This functionality should therefore not have been made available to editor-level users. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin. Patched versions have been released as Wagtail 2.7.4 (for the LTS 2.7 branch) and Wagtail 2.9.3 (for the current 2.9 branch). In these versions, help text will be escaped to prevent the inclusion of HTML tags. Site owners who wish to re-enable the use of HTML within help text (and are willing to accept the risk of this being exploited by editors) may set WAGTAILFORMS_HELP_TEXT_ALLOW_HTML = True in their configuration settings. Site owners who are unable to upgrade to the new versions can secure their form page templates by rendering forms field-by-field as per Django's documentation, but omitting the \|safe filter when outputting the help text.
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/wagtail/wagtail/security/advisories/GHSA-2473-9hgq-j7xw URL:https://github.com/wagtail/wagtail/security/advisories/GHSA-2473-9hgq-j7xw MISC:https://docs.djangoproject.com/en/3.0/ref/models/fields/#django.db.models.Field.help_text URL:https://docs.djangoproject.com/en/3.0/ref/models/fields/#django.db.models.Field.help_text MISC:https://docs.wagtail.io/en/stable/reference/contrib/forms/index.html#usage URL:https://docs.wagtail.io/en/stable/reference/contrib/forms/index.html#usage MISC:https://github.com/wagtail/wagtail/blob/master/docs/releases/2.9.3.rst URL:https://github.com/wagtail/wagtail/blob/master/docs/releases/2.9.3.rst MISC:https://github.com/wagtail/wagtail/commit/d9a41e7f24d08c024acc9a3094940199df94db34 URL:https://github.com/wagtail/wagtail/commit/d9a41e7f24d08c024acc9a3094940199df94db34
Assigning CNA
GitHub (maintainer security advisories)
Date Record Created
20200625	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 (20200625)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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