What’s Vulnerable › Vulnerabilities

CVE-2023-45362

• Severity: medium (CVSS 4.3 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: 2023-11-03 · updated 2026-06-17

Description

An issue was discovered in DifferenceEngine.php in MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. diff-multi-sameuser (aka "X intermediate revisions by the same user not shown") ignores username suppression. This is an information leak.

Affected products

• Wikimedia Foundation MediaWiki: before 1.35.12; from 1.36.0 before 1.39.5; 1.40.0, 1.40.0-rc0 — fixed in 1.35.12, 1.39.5

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.35.12, 1.39.5. Check the vendor advisory for mitigations.

References

• https://lists.debian.org/debian-lts-announce/2023/11/msg00027.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FU2FGUXXK6TMV6R52VRECLC6XCSQQISY/
• https://phabricator.wikimedia.org/T341529
• https://lists.debian.org/debian-lts-announce/2023/11/msg00027.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FU2FGUXXK6TMV6R52VRECLC6XCSQQISY/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FU2FGUXXK6TMV6R52VRECLC6XCSQQISY/
• https://phabricator.wikimedia.org/T341529

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