What’s Vulnerable › Vulnerabilities

CVE-2026-54625: django CMS: Page cache ignores plugin-declared Vary headers (disclosure & poisoning)

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-20 · updated 2026-10-26
• Weakness: CWE-349

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 products

• django-cms: before 5.0.8; from 5.1.0a1, < 5.1.0

References

• https://github.com/django-cms/django-cms/commit/8758714b865ffa79c6bcd0e5c503958ea48885aa
• https://github.com/django-cms/django-cms/commit/d5dc1efa18d157445491c4b12c2dd1efd56f439f
• https://github.com/django-cms/django-cms/pull/8646
• https://github.com/django-cms/django-cms/pull/8647
• https://github.com/django-cms/django-cms/releases/tag/5.0.8
• https://github.com/django-cms/django-cms/releases/tag/5.1.0
• https://github.com/django-cms/django-cms/security/advisories/GHSA-fwjf-m4qw-9f2x

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