CVE-2026-89145: Flextype

Medium severity, CVSS 4.2. EPSS: 0.2% chance of exploitation in the next 30 days.

Flextype CMS versions 0.9.9 through 1.0.0-alpha.3 fail to HTML-escape plugin directory names in the dependency error page rendered by getValidPluginsDependencies(). Attackers with write access to the plugins directory can create a plugin with HTML characters in its name to execute arbitrary scripts in users' browsers when dependency validation fails.

Affected products

• Flextype Flextype: from 0.9.9, up to and including 1.0.0-alpha.3

Published 2026-09-11. Last modified 2026-09-24.