CVE-2020-35478: Fedoraproject Fedora

Medium severity, CVSS 6.1. EPSS: 1.4% chance of exploitation in the next 30 days.

MediaWiki before 1.35.1 allows XSS via BlockLogFormatter.php. MediaWiki:blanknamespace potentially can be output as raw HTML with SCRIPT tags via LogFormatter::makePageLink(). This affects MediaWiki 1.33.0 and later.

Affected products

• Fedoraproject Fedora: version 33 only
• Mediawiki Mediawiki: from 1.33.0, before 1.35.1 (fixed in 1.35.1)

Published 2020-12-18. Last modified 2026-06-17.