Django CMS up to 5.0.8 Plugin Rendering cms/plugin_rendering.py ContentRenderer.render_placeholder cross site scripting

Summaryinfo

A vulnerability identified as problematic has been detected in Django CMS up to 5.0.8. The impacted element is the function ContentRenderer.render_placeholder of the file cms/plugin_rendering.py of the component Plugin Rendering. This manipulation causes cross site scripting. The identification of this vulnerability is CVE-2026-75526. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Django CMS up to 5.0.8. It has been declared as problematic. Affected by this vulnerability is the function ContentRenderer.render_placeholder of the file cms/plugin_rendering.py of the component Plugin Rendering. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

django CMS is an easy-to-use and developer-friendly enterprise content management system powered by Django. From 5.0.8 until 5.0.9, ContentRenderer.render_placeholder in cms/plugin_rendering.py can pass stored, attacker-controlled values to ContentRenderer.render_exception when plugin rendering fails in edit mode. Values from get_short_description(), the exception message, the placeholder, or placeholder.source are interpolated into a cms-rendering-exception heading and later returned through mark_safe. Because the heading is not escaped, stored HTML executes in an editor’s browser, and settings.DEBUG does not prevent the custom heading from rendering. The fix uses format_html to escape the message before safe placeholder output is returned. This issue is fixed in versions 5.0.9.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-75526 since 08/17/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/20/2026). MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 5.0.9 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-63571). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Content Management System

Name

• Django CMS

Version

• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5
• 5.0.6
• 5.0.7
• 5.0.8

License

• open-source

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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