Use of Web Browser Cache Containing Sensitive Information in Django - CVE-2026-48588
Published: July 7, 2026
Vulnerability identifier: #VU137028
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-48588
CWE-ID: CWE-525
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Django Software Foundation
Affected software:
Django
Django
Detailed vulnerability description
The vulnerability allows a remote attacker to expose private data via cached responses.
The vulnerability exists due to improper cache handling in django.middleware.cache.UpdateCacheMiddleware and django.views.decorators.cache.cache_page when processing requests that already contain unrelated cookies. A remote attacker can send a request with an unrelated cookie to expose private data via cached responses.
The issue occurs when a response sets a cookie while varying on Cookie.
How to mitigate CVE-2026-48588
Install security update from vendor's website.