{"id":"PYSEC-2026-201","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","CVE-2026-8404"],"modified":"2026-06-06T10:41:27.896671381Z","published":"2026-06-03T14:16:47.650Z","references":[{"type":"ADVISORY","url":"https://groups.google.com/g/django-announce"},{"type":"FIX","url":"https://docs.djangoproject.com/en/dev/releases/security/"},{"type":"FIX","url":"https://www.djangoproject.com/weblog/2026/jun/03/security-releases/"}],"affected":[{"package":{"name":"django","ecosystem":"PyPI","purl":"pkg:pypi/django"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.2"},{"fixed":"5.2.15"},{"introduced":"6.0"},{"fixed":"6.0.6"}]}],"versions":["5.2","5.2.1","5.2.10","5.2.11","5.2.12","5.2.13","5.2.14","5.2.2","5.2.3","5.2.4","5.2.5","5.2.6","5.2.7","5.2.8","5.2.9","6.0","6.0.1","6.0.2","6.0.3","6.0.4","6.0.5"],"ecosystem_specific":{},"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/django/PYSEC-2026-201.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"}]}