What’s Vulnerable › Vulnerabilities

CVE-2023-36675

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-06-26 · updated 2026-06-17
• Weakness: CWE-79

Description

An issue was discovered in MediaWiki before 1.35.11, 1.36.x through 1.38.x before 1.38.7, and 1.39.x before 1.39.4. BlockLogFormatter.php in BlockLogFormatter allows XSS in the partial blocks feature.

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 — 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/T332889
• https://www.debian.org/security/2023/dsa-5447
• https://www.mediawiki.org/wiki/Release_notes/1.40#Other_changes_in_1.40
• 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/T332889
• https://www.debian.org/security/2023/dsa-5447
• https://www.mediawiki.org/wiki/Release_notes/1.40#Other_changes_in_1.40

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