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CVE-2026-75526

CVE-2026-75526 · django CMS: Stored XSS in edit-mode plugin exception rendering

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 4.4 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • django-cms

    Versions
    • >= 5.0.8, < 5.0.9: Affected

    No fix published

  • django-cms PyPI

    Versions
    • 5.0.8
    Affected ranges
    • ECOSYSTEM: ≥ 5.0.8, < 5.0.9

    Update to 5.0.9

Original sources

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