CVE-2021-46148: Mediawiki

Medium severity, CVSS 6.5. EPSS: 1.2% chance of exploitation in the next 30 days.

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. Some unprivileged users can view confidential information (e.g., IP addresses and User-Agent headers for election traffic) on a testwiki SecurePoll instance.

Affected products

• Mediawiki Mediawiki: before 1.35.5 (fixed in 1.35.5); from 1.36.0, before 1.36.3 (fixed in 1.36.3); from 1.37.0, before 1.37.1 (fixed in 1.37.1)

Published 2022-01-10. Last modified 2026-06-17.