CVE-2021-42048: Mediawiki

Medium severity, CVSS 4.8. EPSS: 0.7% chance of exploitation in the next 30 days.

An issue was discovered in the Growth extension in MediaWiki through 1.36.2. Any admin can add arbitrary JavaScript code to the Newcomer home page footer, which can be executed by viewers with zero edits.

Affected products

• Mediawiki Mediawiki: up to and including 1.36.2

Published 2022-09-29. Last modified 2026-06-17.