Vulnerability · Published Aug 20, 2026 · Assigned by GitHub_M
CVE-2026-54625django CMS: Page cache ignores plugin-declared Vary headers (disclosure & poisoning)
Medium 4.8
In plain English
A medium-severity security flaw in django-cms from django-cms. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | django-cms | 5.0.8 | GHSA-fwjf-m4qw-9f2x |
| PyPI | django-cms | 5.0.8 | PYSEC-2026-3824 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| django-cms | django-cms | < 5.0.8>= 5.1.0a1, < 5.1.0 |
Weakness: CWE-349, CWE-524 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
References
- https://github.com/django-cms/django-cms/security/advisories/GHSA-fwjf-m4qw-9f2x x_refsource_CONFIRM
- https://github.com/django-cms/django-cms/pull/8646 x_refsource_MISC
- https://github.com/django-cms/django-cms/pull/8647 x_refsource_MISC
- https://github.com/django-cms/django-cms/commit/8758714b865ffa79c6bcd0e5c503958ea48885aa x_refsource_MISC
- https://github.com/django-cms/django-cms/commit/d5dc1efa18d157445491c4b12c2dd1efd56f439f x_refsource_MISC
- https://github.com/django-cms/django-cms/releases/tag/5.0.8 x_refsource_MISC
- https://github.com/django-cms/django-cms/releases/tag/5.1.0 x_refsource_MISC