CVE-2020-27621: Mediawiki

Medium severity, CVSS 4.3. EPSS: 0.7% chance of exploitation in the next 30 days.

The FileImporter extension in MediaWiki through 1.35.0 was not properly attributing various user actions to a specific user's IP address. Instead, for various actions, it would report the IP address of an internal Wikimedia Foundation server by omitting X-Forwarded-For data. This resulted in an inability to properly audit and attribute various user actions performed via the FileImporter extension.

Affected products

• Mediawiki Mediawiki: up to and including 1.35.0

Published 2020-10-22. Last modified 2026-06-17.