CVE-2023-45360: Mediawiki

Medium severity, CVSS 5.4. EPSS: 0.6% chance of exploitation in the next 30 days.

An issue was discovered in MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. There is XSS in youhavenewmessagesmanyusers and youhavenewmessages i18n messages. This is related to MediaWiki:Youhavenewmessagesfromusers.

Affected products

• Mediawiki Mediawiki: before 1.35.12 (fixed in 1.35.12); from 1.39.0, before 1.39.5 (fixed in 1.39.5); version 1.40.0 only

Published 2023-11-03. Last modified 2026-06-17.