EUVD-2026-63571
GHSA-hvq6-2r72-p2x7
Severity by source
AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
AV:N for web-accessible CMS; AC:H for exception-trigger requirement; PR:L for editor role; UI:R for victim interaction; S:C for browser scope change; C:L/I:L for session theft and DOM manipulation; A:N as no availability impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Stored XSS in django CMS 5.0.8 allows an authenticated editor to execute arbitrary HTML in other staff users' browsers via the edit-mode plugin exception rendering path. When plugin rendering fails in edit mode, ContentRenderer.render_exception in cms/plugin_rendering.py interpolates attacker-controlled values - including get_short_description() output, exception messages, and placeholder source strings - into an HTML heading using an unsafe f-string, then returns the result through mark_safe, bypassing Django's autoescaping. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three concurrent conditions: (1) The attacker holds at least low-privileged CMS editor access (PR:L per CVSS) sufficient to store a malicious payload in a plugin field contributing to get_short_description(), in an exception message context, or in a placeholder source string such as a page content title editable by that role. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 4.4 (Medium) accurately reflects the constrained attack surface: AC:H captures the requirement that a plugin rendering exception must be triggered in edit mode - not a default state - while PR:L and UI:R together require both the attacker and a victim to hold authenticated staff sessions. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with low-privileged CMS editor access stores an XSS payload such as '<img src=x onerror=alert(document.cookie)>' in a plugin field that populates get_short_description() or in a page title used as a placeholder source string. When a plugin rendering exception is subsequently triggered on a page containing that data, a second authenticated staff user visiting the affected placeholder in edit mode will have the payload execute in their browser, potentially exposing their session token or enabling further actions under their identity. … |
| Remediation | Upgrade django CMS to version 5.0.9, confirmed fixed per the GitHub release at https://github.com/django-cms/django-cms/releases/tag/5.0.9 and applied in commit b56a568844ff3702495945f73a31d0868285bf88 via pull request https://github.com/django-cms/django-cms/pull/8711. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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