What is CVE-2023-45363?

CVE-2023-45363 is a high-severity vulnerability in MediaWiki, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2023-10-09.

How severe is CVE-2023-45363?

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

Vulnerability in MediaWiki

CVE-2023-45363

An issue was discovered in ApiPageSet.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. It allows attackers to cause a denial of service (unbounded loop and RequestTimeoutException) when querying pages redirected to other variants with redirects and converttitles set.

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: 0.227 (97.7th percentile), scored 2026-09-28.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.227 · newest: 0.227 · change: 0.000

Affected products

MediaWiki — versions 1.40.0
Debian Linux — versions 11.0, 12.0

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

phabricator.wikimedia.org/T333050 (Exploit, Third Party Advisory, Vendor Advisory)
www.debian.org/security/2023/dsa-5520 (vendor-advisory, Third Party Advisory)
lists.debian.org/debian-lts-announce/2023/11/msg00027.html (mailing-list)

Frequently asked questions

What is CVE-2023-45363?: CVE-2023-45363 is a high-severity vulnerability in MediaWiki, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2023-10-09.
How severe is CVE-2023-45363?: High severity. CVSS v3 base score is 7.5 out of 10.