CVE-2021-31551: Mediawiki

Medium severity, CVSS 6.1. EPSS: 0.9% chance of exploitation in the next 30 days.

An issue was discovered in the PageForms extension for MediaWiki through 1.35.2. Crafted payloads for Token-related query parameters allowed for XSS on certain PageForms-managed MediaWiki pages.

Affected products

• Mediawiki Mediawiki: up to and including 1.35.2

Published 2021-04-22. Last modified 2026-06-17.