What’s Vulnerable › Vulnerabilities

CVE-2026-8404: Potential exposure of private data via case-sensitive Cache-Control directives in UpdateCacheMiddleware

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-03 · updated 2026-07-21
• Weakness: CWE-178

Description

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

• Django: from 5.2 before 5.2.15; from 6.0 before 6.0.6 — fixed in 5.2.15, 6.0.6
• Pypi Django: before 5.2.15; from 6.0.0 before 6.0.6; 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.1, 1.1.1 (+422) — fixed in 5.2.15, 6.0.6

How to fix

Upgrade to a fixed version: Django 5.2.15, 6.0.6; Pypi Django 5.2.15, 6.0.6. 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/jun/03/security-releases/

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