CVE-2015-6734: Mediawiki

Medium severity, CVSS 4.3. EPSS: 2.1% chance of exploitation in the next 30 days.

Cross-site scripting (XSS) vulnerability in contrib/cssgen.php in the GeSHi, as used in the SyntaxHighlight_GeSHi extension and MediaWiki before 1.23.10, 1.24.x before 1.24.3, and 1.25.x before 1.25.2, allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Affected products

• Mediawiki Mediawiki: up to and including 1.23.9; version 1.24.0 only; version 1.24.1 only; version 1.24.2 only; version 1.25.0 only; version 1.25.1 only

Published 2015-09-01. Last modified 2026-06-17.