CVE-2023-45371

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% 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-770

Description

An issue was discovered in the Wikibase extension for MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. There is no rate limit for merging items.

Affected products

Wikimedia Foundation MediaWiki: before 1.35.12; from 1.36.0 before 1.39.5; 1.40.0 — 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://gerrit.wikimedia.org/r/c/mediawiki/extensions/Wikibase/+/961264
https://phabricator.wikimedia.org/T345064
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Wikibase/+/961264
https://phabricator.wikimedia.org/T345064

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