An issue was discovered in MediaWiki before 1.37.3 and 1.38.x before 1.38.1.

published 2022-07-02 4 y ago modified 2026-06-17 4 mo ago also BIT-mediawiki-2022-34912 , EUVD-2022-37816

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 65%
public exploits: 0; none known

An issue was discovered in MediaWiki before 1.37.3 and 1.38.x before 1.38.1. The contributions-title, used on Special:Contributions, is used as page title without escaping. Hence, in a non-default configuration where a username contains HTML entities, it won't be escaped.

Patch / fix

fixed in 2 distros 2

bitnami mediawiki 1.37.3, 1.38.1
mediawiki mediawiki 1.37.3

debian arch linux

mediawiki Debian 14, Debian 13, Debian 12 1:1.35.7-1

debian advisories DEBIAN-CVE-2022-34912

mediawiki Arch Linux 1.38.3-1

arch linux advisories AVG-2823

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-34912 updated 2025-11-21 cvss 6.1

mediawiki: Username not escaped in the contributions-title message

Red Hat OpenShift Container Platform 3.11 mediawiki
affected: no fix planned “Out of support scope”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.10% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N
OSV	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
bitnami	mediawiki	<1.37.3 >=1.38.0, <1.38.1	1.37.3 1.38.1

References

lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/7N5ZBWLNNPZKFK7Q4KEHGCJ2YELQEUJP/
vendor-advisory, web
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/DKKOQXPYLMBSEVDHFS32BPBR3ZQJKY5B/
vendor-advisory, web
debian.org /security/2022/dsa-5246
vendor-advisory, third-party-advisory, web
security.gentoo.org /glsa/202305-24
vendor-advisory, web
phabricator.wikimedia.org /T308473
issue-tracking, vendor-advisory, web
lists.debian.org /debian-lts-announce/2022/09/msg00027.html
mailing-list, third-party-advisory, web
nvd.nist.gov /vuln/detail/CVE-2022-34912
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary