CVE-2026-8404: Djangoproject Django

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6. `django.middleware.cache.UpdateCacheMiddleware` in Django does not match `Cache-Control` response directives case-insensitively, which allows remote attackers to read responses that were incorrectly cached because their `Cache-Control` directives used uppercase or mixed-case values. 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 Ahmed Badawe for reporting this issue.

Affected products

• Djangoproject Django: from 5.2, before 5.2.15 (fixed in 5.2.15); from 6.0, before 6.0.6 (fixed in 6.0.6)

Published 2026-06-03. Last modified 2026-07-21.