CVE-2026-55742: Cotonti

Critical severity, CVSS 9.6. EPSS: 0.2% chance of exploitation in the next 30 days.

Cotonti 1.0.0 (master branch, commit f43f1fc3) is vulnerable to Cross-Site Request Forgery in the administration rights handler. In system/admin/admin.rights.php, the rights update action ('a=update') modifies group access rights (including via cot_auth_add_group) without calling cot_check_xg to validate the anti-CSRF token.

Affected products

• Cotonti Cotonti: version 1.0.0 only

Published 2026-06-18. Last modified 2026-08-10.