Potential exposure of private data via cached Set-Cookie response
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.
02 / AFFECTED SOFTWARE
Affected packages
23 explicit affected versions
23 explicit affected versions
430 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
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.
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.
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.
05 / REFERENCES
Further evidence
- https://docs.djangoproject.com/en/dev/releases/security/
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48588.json
- https://github.com/django/django/
- https://groups.google.com/g/django-announce
- https://nvd.nist.gov/vuln/detail/CVE-2026-48588
- https://pypi.org/project/Django/
- https://www.djangoproject.com/weblog/2026/jul/07/security-releases/
- https://docs.djangoproject.com/en/dev/releases/security
- https://github.com/django/django
- https://github.com/django/django/commit/64f9a2b2283fde3ec69fb0dfe441cf0f6f411ba3
- https://github.com/django/django/commit/6e365f8d01f2ba0bbd90968d76a42600fb8bc4b1
- https://github.com/django/django/commit/721685aa7799cc9327bd202cd1f70bd012ca95a7
- https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-2090.yaml
- https://www.djangoproject.com/weblog/2026/jul/07/security-releases
- https://github.com/advisories/GHSA-3h9f-r86x-qvjx