CVE-2023-29137: Mediawiki

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

An issue was discovered in the GrowthExperiments extension for MediaWiki through 1.39.3. The UserImpactHandler for GrowthExperiments inadvertently returns the timezone preference for arbitrary users, which can be used to de-anonymize users.

Affected products

• Mediawiki Mediawiki: up to and including 1.39.3

Published 2023-03-31. Last modified 2026-06-17.