CVE-2025-61638: Mediawiki

Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days.

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki, Wikimedia Foundation Parsoid. This vulnerability is associated with program files includes/parser/Sanitizer.Php, src/Core/Sanitizer.Php. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1; Parsoid: from * before 0.16.6, 0.20.4, 0.21.1.

Affected products

• Mediawiki Mediawiki: before 1.39.14 (fixed in 1.39.14); from 1.39.15, before 1.43.4 (fixed in 1.43.4); from 1.43.5, before 1.44.1 (fixed in 1.44.1)
• Wikimedia Parsoid: before 0.16.6 (fixed in 0.16.6); after 0.16.6, before 0.20.4 (fixed in 0.20.4); after 0.20.4, before 0.21.1 (fixed in 0.21.1)

Published 2026-02-03. Last modified 2026-06-17.