django CMS: Stored XSS in edit-mode plugin exception rendering (CVE-2026-75526) | HOL Guard CVE

Medium · CVSS 4.4CVE-2026-75526GHSA-HVQ6-2R72-P2X7

django CMS: Stored XSS in edit-mode plugin exception rendering

Answer in brief

CVE-2026-75526 records a Medium severity (CVSS 4.4) vulnerability in django CMS: Stored XSS in edit-mode plugin exception rendering. The current sources do not mark it as known exploited. The current feed maps django-cms/django-cms (generic), django-cms (pypi). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 20, 2026Updated Aug 20, 2026Source checked Aug 20, 2026First seen by HOL Aug 20, 2026Material review Aug 20, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 4.4
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 4.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps django-cms/django-cms (generic), django-cms (pypi). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
django-cms/django-cmsgeneric	>= 5.0.8, < 5.0.9	Not reported
django-cmspypi	>=5.0.8 <5.0.9	5.0.9

Recommended response

Check inventory. Check lockfiles and deployed manifests for django-cms/django-cms, django-cms.
Review the reported fix. Update django-cms to 5.0.9 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 20, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 20, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 20, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.