CVE-2023-36674

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-08-20 · updated 2026-06-17
Weakness: CWE-20

Description

An issue was discovered in MediaWiki before 1.35.11, 1.36.x through 1.38.x before 1.38.7, 1.39.x before 1.39.4, and 1.40.x before 1.40.1. It is possible to bypass the Bad image list (aka badFile) by using the thumb parameter (aka Manualthumb) of the File syntax.

Affected products

Wikimedia Foundation MediaWiki: before 1.35.11; from 1.36.0 before 1.38.7; from 1.39.0 before 1.39.4; 1.40.0 — fixed in 1.35.11, 1.38.7, 1.39.4

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.35.11, 1.38.7, 1.39.4. Check the vendor advisory for mitigations.

References

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2UIVGYECQGTUC2LLPVCZBPDLCTOHL2F6/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6CHRX6DSLAMVXCV2YMJEWOLTBEYSESE5/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DOAXEGYBOEM4JWB4J3BDH73NK2LCYC3O/
https://phabricator.wikimedia.org/T335612
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2UIVGYECQGTUC2LLPVCZBPDLCTOHL2F6/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6CHRX6DSLAMVXCV2YMJEWOLTBEYSESE5/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DOAXEGYBOEM4JWB4J3BDH73NK2LCYC3O/
https://phabricator.wikimedia.org/T335612

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