Vulnerability in Djangoproject Django
CVE-2026-8404
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Djangoproject Django — versions 6.0, 6.0.6, 5.2
Weakness classification (CWE)
References
- 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (vendor-advisory, Patch, Vendor Advisory)
- 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (mailing-list, Release Notes)
- 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (vendor-advisory, Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-8404?
- CVE-2026-8404 is a low-severity vulnerability in Djangoproject Django, classified under Improper Handling of Case Sensitivity. CVSS score: 3.1/10. Published 2026-06-03.
- How severe is CVE-2026-8404?
- Low severity. CVSS v3 base score is 3.1 out of 10.