CVE-2026-8404

Potential exposure of private data via case-sensitive Cache-Control directives in UpdateCacheMiddleware

Published Jun 3, 2026 CVSS 4.0 · 2.3 Low EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-8cjm-8mp7-r2xf Django: UpdateCacheMiddleware may disclose cached responses due to case-sensitive Cache-Control handling
History
Type Values Removed Values Added
CPEs cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Djangoproject
Djangoproject django
Vendors & Products Djangoproject
Djangoproject django
Type Values Removed Values Added
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.
Title Potential exposure of private data via case-sensitive Cache-Control directives in UpdateCacheMiddleware
Weaknesses CWE-178
References
Metrics cvssV3_1

{'score': 3.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N'}

cvssV4_0

{'score': 2.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
DSF
Published
Updated
Jun 3, 2026, 3:46 PM
Reserved
May 12, 2026, 3:06 PM
Status
Analyzed
Published
Jun 3, 2026, 2:16 PM
Modified
Jul 21, 2026, 7:10 PM
Severity
Low
Public date
Jun 3, 2026, 1:16 PM