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 cotauthaddgroup) without calling cotcheck_xg() to validate the anti-CSRF token. A remote attacker who lures an authenticated administrator into visiting a malicious page can force the browser to submit a forged request that grants elevated permissions to an attacker-controlled group, escalating privileges to administrator. Because Cotonti administrators can modify templates and configuration, this can be further leveraged toward remote code execution.
{
"github_reviewed": true,
"github_reviewed_at": "2026-06-19T14:52:08Z",
"nvd_published_at": "2026-06-18T08:16:34Z",
"severity": "CRITICAL",
"cwe_ids": [
"CWE-352"
]
}