EUVD-2026-63564
GHSA-fwjf-m4qw-9f2x
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
AC:H because exploitation requires both CMS_PAGE_CACHE enabled and a vary-header plugin deployed; PR:N since no authentication is needed once those conditions hold; C:L/I:L for cross-user content leakage and cache poisoning respectively; A:N as no availability impact is described.
Primary rating from Vendor (github).
CVSS VectorVendor: github
Lifecycle Timeline
3DescriptionCVE.org
django CMS is a content management system powered by Django. Prior to 5.0.8 and in 5.1.0a1, the django CMS page cache in cms/cache/page.py ignores request headers declared by plugins through get_vary_cache_on(). The _page_cache_key function includes the cache prefix, site, language, path, and timezone but not the declared header values. Although set_page_cache adds those names to the response Vary header, get_page_cache retrieves the first stored variant under the same header-agnostic key. When CMS_PAGE_CACHE is enabled and a plugin varies content on a header such as Country-Code, one visitor can receive another visitor’s request-specific content, and an unauthenticated attacker can prime the cache with attacker-chosen content. This issue is fixed in versions 5.0.8 and 5.1.0.
AnalysisAI
Cache isolation failure in django CMS allows unauthenticated network attackers to both read other users' header-personalized page content and poison the page cache with attacker-chosen content. Affected installations must have CMS_PAGE_CACHE enabled and at least one plugin implementing get_vary_cache_on() - when those conditions hold, the page cache key is computed without the plugin-declared header values, so the first cached variant is served to all subsequent visitors regardless of their headers. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Two non-default conditions must both be true: (1) CMS_PAGE_CACHE must be explicitly enabled in Django settings - it is a configurable CMS option, not enabled by default in all deployment guides; (2) at least one CMS plugin installed on the target page must implement get_vary_cache_on() to declare that its rendered output varies on a specific request header. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 4.8 Medium with vector AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N reflects accurate real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to django CMS 5.0.8 (stable branch) or 5.1.0 (current branch); both releases contain the fix per the tagged GitHub releases at https://github.com/django-cms/django-cms/releases/tag/5.0.8 and https://github.com/django-cms/django-cms/releases/tag/5.1.0. … Detailed patch versions, workarounds, and compensating controls in full report. |
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