MEDIUM 5.3

PYSEC-2026-2090

Quick fix

PYSEC-2026-2090 — django: upgrade to the fixed version with the command below.

pip install --upgrade 'django>=5.2.16'

Details

An issue was discovered in Django 6.0 before 6.0.7 and 5.2 before 5.2.16. `UpdateCacheMiddleware` and the `cache_page()` decorator cache responses that vary on cookies when the incoming request carries unrelated cookies, which allows remote attackers to read private data from the shared cache. 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 Chris Whyland for reporting this issue.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI / django

Introduced in: 5.2 Fixed in: 5.2.16

Fix pip install --upgrade 'django>=5.2.16'

References

https://groups.google.com/g/django-announce [ADVISORY]
https://docs.djangoproject.com/en/dev/releases/security/ [FIX]
https://www.djangoproject.com/weblog/2026/jul/07/security-releases/ [FIX]