---
id: CVE-2026-35193
aliases:
  - GHSA-qpc8-7fxc-cm4p
  - BIT-django-2026-35193
  - PYSEC-2026-197
title: >-
  Django: UpdateCacheMiddleware may disclose private cached responses by
  omitting Authorization from Vary
summary: >-
  Django: UpdateCacheMiddleware may disclose private cached responses by
  omitting Authorization from Vary
severity: low
cvss: 3.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N'
vendor: django
product: django
ecosystem: pip
affected:
  - 'django >= 5.2.0, < 5.2.15'
  - 'django >= 6.0.0, < 6.0.6'
patched:
  - django 5.2.15
  - django 6.0.6
published: '2026-06-03'
updated: '2026-08-07'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-qpc8-7fxc-cm4p'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-35193'
  - url: >-
      https://github.com/django/django/commit/050a3dc276f9142067260e990e4d8d42d5e32863
  - url: >-
      https://github.com/django/django/commit/664652f1a2dd80d8a4cd491b4313cad915ae6669
  - url: >-
      https://github.com/django/django/commit/a2faa8e895926ac5d63f72879b5ccf671b5b4ba9
  - url: 'https://docs.djangoproject.com/en/dev/releases/security'
  - url: >-
      https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-197.yaml
  - url: 'https://groups.google.com/g/django-announce'
  - url: 'https://www.djangoproject.com/weblog/2026/jun/03/security-releases'
tags:
  - osv
  - pip
epss: 0.00432
epssPercentile: 0.34815
ingestedAt: '2026-08-08T19:14:54.746Z'
---

## Overview

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.

## Affected packages

- `django >= 5.2.0, < 5.2.15`
- `django >= 6.0.0, < 6.0.6`

## Remediation

Upgrade to a patched release:

- `django 5.2.15`
- `django 6.0.6`