CVE-2021-31555: Mediawiki

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

An issue was discovered in the Oauth extension for MediaWiki through 1.35.2. It did not validate the oarc_version (aka oauth_registered_consumer.oarc_version) parameter's length.

Affected products

• Mediawiki Mediawiki: up to and including 1.35.2

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