CVE-2026-39840: Mediawiki Cargo

Medium severity, CVSS 6.1. EPSS: 0.2% chance of exploitation in the next 30 days.

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation Mediawiki - Cargo Extension allows XSS Targeting Non-Script Elements.This issue affects Mediawiki - Cargo Extension: before 3.8.7.

Affected products

• Mediawiki Cargo: before 3.8.7 (fixed in 3.8.7)

Published 2026-04-07. Last modified 2026-07-24.