CVE-2020-35475: Debian Linux

High severity, CVSS 7.5. EPSS: 1.6% chance of exploitation in the next 30 days.

In MediaWiki before 1.35.1, the messages userrights-expiry-current and userrights-expiry-none can contain raw HTML. XSS can happen when a user visits Special:UserRights but does not have rights to change all userrights, and the table on the left side has unchangeable groups in it. (The right column with the changeable groups is not affected and is escaped correctly.)

Affected products

• Debian Debian Linux: version 10.0 only
• Fedoraproject Fedora: version 33 only
• Mediawiki Mediawiki: before 1.35.1 (fixed in 1.35.1)

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