5.3

CVE-2026-8404: djangoproject django Improper Handling of Case Sensitivity

CVSS: 5.3v3.1MediumAnalyzed
AliasesGHSA-8cjm-8mp7-r2xfBIT-django-2026-8404PYSEC-2026-201
Published 03-06-2026Last modified 03-06-2026
Open JSON

Vulnerability summary

CVE-2026-8404 is a medium (CVSS 5.3) Improper Handling of Case Sensitivity vulnerability in djangoproject django. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 35.7% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (NVD)
EPSS score
0.43%
0%100%
Low · +0.14 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 8 · Related 8
MGASA-2026-0324OPENSUSE-SU-2026:10989-1OPENSUSE-SU-2026:11002-1OPENSUSE-SU-2026:11003-1OPENSUSE-SU-2026:11270-1OPENSUSE-SU-2026:20937-1

Timeline

  1. 03-06-2026
    PublishedVulnerability first disclosed.
  2. 03-06-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

9 scores · 6 sources · 2 versions

EPSS trend

Probability

0.43%

Chance of exploitation in the next 30 days

Percentile

36%

Versus all other CVEs

30-day change

+0.14 pp

From 0.29% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.43%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard9 products
  • authentik-2025.12All versions (No fix recorded)
  • authentik-fips-2025.12All versions (No fix recorded)
  • awxAll versions (No fix recorded)
  • openstack-horizon-2025.1All versions (No fix recorded)
  • openstack-horizon-2025.1-fipsAll versions (No fix recorded)
Debian1 product
  • python-djangoAll versions (No fix recorded) | < 3:5.2.15-1
Djangoproject1 product
  • django≥ 5.2, < 5.2.15 | ≥ 6.0, < 6.0.6
PyPI1 product
  • django< 5.2.15 | ≥ 6.0.0, < 6.0.6 | ≥ 6.0, < 6.0.6
Ubuntu1 product
  • python-django< 2:2.2.12-1ubuntu0.29+esm10 | < 2:3.2.12-2ubuntu1.29 | < 3:4.2.11-1ubuntu1.18 | All versions (No fix recorded) | < 3:5.2.9-0ubuntu4.3

5 vendors · 13 products

References

19 links
Show all 19 references