CVE-2023-45364

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-10-09 · updated 2026-06-17
Weakness: CWE-732

Description

An issue was discovered in includes/page/Article.php in MediaWiki 1.36.x through 1.39.x before 1.39.5 and 1.40.x before 1.40.1. Deleted revision existence is leaked due to incorrect permissions being checked. This reveals that a given revision ID belonged to the given page title, and its timestamp, both of which are not supposed to be public information.

Affected products

Debian Linux: 11.0, 12.0
Wikimedia Foundation MediaWiki: from 1.36.0 before 1.39.5; 1.40.0 — fixed in 1.39.5

How to fix

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

References

https://phabricator.wikimedia.org/T264765
https://www.debian.org/security/2023/dsa-5520
https://phabricator.wikimedia.org/T264765
https://www.debian.org/security/2023/dsa-5520

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