What’s Vulnerable › Vulnerabilities

CVE-2026-6907: Potential exposure of private data due to incorrect handling of Vary: * in UpdateCacheMiddleware

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-05 · updated 2026-10-26
• Weakness: CWE-524

Description

An issue was discovered in 6.0 before 6.0.5 and 5.2 before 5.2.14. `django.middleware.cache.UpdateCacheMiddleware` erroneously caches requests where the `Vary` header contained an asterisk (`'*'`). This can lead to private data being stored and served. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Ahmad Sadeddin for reporting this issue.

Affected products

• Django: from 5.2 before 5.2.14; from 6.0 before 6.0.5 — fixed in 5.2.14, 6.0.5

How to fix

Upgrade to a fixed version: Django 5.2.14, 6.0.5. Check the vendor advisory for mitigations.

References

• https://docs.djangoproject.com/en/dev/releases/security/
• https://groups.google.com/g/django-announce
• https://www.djangoproject.com/weblog/2026/may/05/security-releases/

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