PT-2026-33205 · Wikimedia Foundation+4 · Mediawiki

CVE-2026-34091 · Published 2026-04-03 · Updated 2026-05-14

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions MediaWiki versions prior to 1.43.7 MediaWiki versions prior to 1.44.4 MediaWiki versions prior to 1.45.2

Description An issue in Wikimedia Foundation MediaWiki allows the exposure of sensitive information to an unauthorized actor.

Recommendations Update to version 1.43.7. Update to version 1.44.4. Update to version 1.45.2.

Fix

Information Disclosure

Weakness Enumeration

CWE-200

Related Identifiers

CVE-2026-34091

Affected Products

Mediawiki

References · 13

• https://phabricator.wikimedia.org/T411305 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-34091 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-34091 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-34091 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-34091 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-34091 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-34091 · Security Note
• https://ubuntu.com/security/CVE-2026-34091 · Vendor Advisory
• https://lists.wikimedia.org/hyperkitty/list/[e-mail]/thread/DIBLSBHISKX6NFRUFNOGZRVW42E7R2QP · Note
• https://t.me/cveNotify/163486 · Telegram Post
• https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1265637 · Note
• https://twitter.com/CVEnew/status/2053932473936236565 · Twitter Post
• https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1265651 · Note