CVE-2026-63000: Redaxo Core

Medium severity, CVSS 6.4. EPSS: 0.1% chance of exploitation in the next 30 days.

REDAXO is a PHP-based content management system. Prior to 5.21.2, rex_api_install_package_update in redaxo/src/addons/install/lib/api/api_package_update.php inherits the false default from rex_api_function::requiresCsrfProtection() instead of requiring a CSRF token. An unauthenticated attacker can cause a logged-in administrator's browser to request a selected package update from the configured REDAXO package server, changing installed addon code or disrupting the site without the administrator's intent. This issue is fixed in version 5.21.2.

Affected products

• Redaxo Core: before 5.21.2 (fixed in 5.21.2)

Published 2026-09-23. Last modified 2026-09-29.