{"id":"CVE-2026-8404","summary":"Potential exposure of private data via case-sensitive Cache-Control directives in UpdateCacheMiddleware","details":"An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6.\n`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.\nEarlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected.\nDjango would like to thank Ahmed Badawe for reporting this issue.","aliases":["BIT-django-2026-8404","PYSEC-2026-201"],"modified":"2026-07-15T10:14:46.580993600Z","published":"2026-06-03T13:16:29.593Z","related":["SUSE-SU-2026:2318-1","openSUSE-SU-2026:10989-1","openSUSE-SU-2026:11002-1","openSUSE-SU-2026:11003-1","openSUSE-SU-2026:11270-1","openSUSE-SU-2026:20937-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8404.json","cna_assigner":"DSF","cwe_ids":["CWE-178"]},"references":[{"type":"WEB","url":"https://github.com/django/django/"},{"type":"ADVISORY","url":"https://docs.djangoproject.com/en/dev/releases/security/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8404.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8404"},{"type":"ADVISORY","url":"https://www.djangoproject.com/weblog/2026/jun/03/security-releases/"},{"type":"PACKAGE","url":"https://pypi.org/project/Django/"},{"type":"ARTICLE","url":"https://groups.google.com/g/django-announce"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/django/django","events":[{"introduced":"9e7cc2b628fe8fd3895986af9b7fc9525034c1b0"},{"fixed":"21e98408f84d22191e2c7ee4052bdd12d264fd3f"},{"introduced":"36b5f39d9372147f0e758f590e35ee2b2bc317dd"},{"fixed":"ee93f65169c280c9ab3d2ce103dd478c96d05065"}],"database_specific":{"cpe":"cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"5.2"},{"fixed":"5.2.15"},{"introduced":"6.0"},{"fixed":"6.0.6"}],"source":"CPE_RANGE"}}],"versions":["5.2.14","6.0.5","5.2.13","6.0.4","5.2.12","6.0.3","5.2.11","6.0.2","6.0.1","5.2.10","6.0","5.2.9","5.2.8","5.2.7","5.2.6","5.2.5","5.2.4","5.2.3","5.2.2","5.2.1","5.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-8404.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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"}]}