What is CVE-2022-28203?

CVE-2022-28203 is a high-severity vulnerability in MediaWiki, classified under Release of Invalid Pointer or Reference. CVSS score: 7.5/10. Published 2022-09-19.

How severe is CVE-2022-28203?

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

Vulnerability in MediaWiki

CVE-2022-28203

A denial-of-service issue was discovered in MediaWiki before 1.35.6, 1.36.x before 1.36.4, and 1.37.x before 1.37.2. When many files exist, requesting Special:NewFiles with actor as a condition can result in a very long running query.

Published 2022-09-19 · 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: 0.015 (72.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 72.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.015 · change: +0.002

Affected products

MediaWiki
Debian Linux — versions 10.0, 11.0

Weakness classification (CWE)

CWE-763 — Release of Invalid Pointer or Reference

References

phabricator.wikimedia.org/T297731 (Exploit, Patch, Issue Tracking, Vendor Advisory)
lists.debian.org/debian-lts-announce/2022/09/msg00027.html (mailing-list, Mailing List, Third Party Advisory)
www.debian.org/security/2022/dsa-5246 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2022-28203?: CVE-2022-28203 is a high-severity vulnerability in MediaWiki, classified under Release of Invalid Pointer or Reference. CVSS score: 7.5/10. Published 2022-09-19.
How severe is CVE-2022-28203?: High severity. CVSS v3 base score is 7.5 out of 10.