CVE-2026-35193

Potential exposure of private data via missing Vary: Authorization in UpdateCacheMiddleware

Published Jun 3, 2026 CVSS 4.0 · 2.3 Low EPSS < 1% KEV · Not listed
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 add `Authorization` to the `Vary` response header for requests bearing that header without `Cache-Control: public`, which allows remote attackers to read private cached responses via unauthenticated requests to the same URL.
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 Shai Berger for reporting this issue.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-qpc8-7fxc-cm4p Django: UpdateCacheMiddleware may disclose private cached responses by omitting Authorization from Vary
History
Type Values Removed Values Added
CPEs cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Djangoproject
Djangoproject django
Vendors & Products Djangoproject
Djangoproject django
Type Values Removed Values Added
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 add `Authorization` to the `Vary` response header for requests bearing that header without `Cache-Control: public`, which allows remote attackers to read private cached responses via unauthenticated requests to the same URL. 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 Shai Berger for reporting this issue.
Title Potential exposure of private data via missing Vary: Authorization in UpdateCacheMiddleware
Weaknesses CWE-524
References
Metrics cvssV3_1

{'score': 3.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N'}

cvssV4_0

{'score': 2.3, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
DSF
Published
Updated
Jun 3, 2026, 3:47 PM
Reserved
Apr 1, 2026, 6:21 PM
Status
Analyzed
Published
Jun 3, 2026, 2:16 PM
Modified
Jul 21, 2026, 7:10 PM
Severity
Low
Public date
Jun 3, 2026, 1:16 PM