What is CVE-2023-45371?

CVE-2023-45371 is a high-severity vulnerability in MediaWiki, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2023-10-09.

How severe is CVE-2023-45371?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in MediaWiki

CVE-2023-45371

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.

Published 2023-10-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.005 (41.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

MediaWiki — versions 1.40.0

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

phabricator.wikimedia.org/T345064 (Permissions Required, Issue Tracking)
gerrit.wikimedia.org/r/c/mediawiki/extensions/Wikibase/+/961264 (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2023-45371?: CVE-2023-45371 is a high-severity vulnerability in MediaWiki, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2023-10-09.
How severe is CVE-2023-45371?: High severity. CVSS v3 base score is 7.5 out of 10.