CVE-2026-6907
Potential exposure of private data due to incorrect handling of Vary: * in UpdateCacheMiddleware
4.3
MEDIUM
CVSS 3.1
EPSS 0.36%
Description
An issue was discovered in 6.0 before 6.0.5 and 5.2 before 5.2.14. `django.middleware.cache.UpdateCacheMiddleware` erroneously caches requests where the `Vary` header contained an asterisk (`'*'`). This can lead to private data being stored and served. 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 Ahmad Sadeddin for reporting this issue.
How to fix CVE-2026-6907
To remediate CVE-2026-6907, upgrade the affected package to a fixed version below.
- —upgrade to 5.2.14 or later
- —no fix listed
- —upgrade to 6.0.5 or later
- —upgrade to 5.2.14 or later
Is CVE-2026-6907 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- >= 5.2.0, < 5.2.14, >= 6.0.0, < 6.0.5
- from 0
- >= 6.0, < 6.0.5
- >= 5.2, < 5.2.14, >= 6.0, < 6.0.5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |