CVE-2026-58520: Mediawiki

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

URL redirection to untrusted site ('open redirect') vulnerability in The Wikimedia Foundation Mediawiki - UrlShortener Extension allows Cross-Site Flashing. This issue affects Mediawiki - UrlShortener Extension: from * before 1.43.9, 1.44.6, 1.45.4.

Affected products

• Mediawiki Mediawiki: from 1.43.0, before 1.43.9 (fixed in 1.43.9); from 1.44.0, before 1.44.6 (fixed in 1.44.6); from 1.45.0, before 1.45.4 (fixed in 1.45.4)

Published 2026-07-01. Last modified 2026-07-09.