CVE-2026-57518

CVE-2026-57518 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Pagekit CMS 1.0.18 contains a privilege escalation vulnerability that allows authenticated users with the 'user: manage users' permission to escalate privileges by assigning arbitrary custom roles to themselves due to missing authorization checks in UserApiController::saveAction(). Attackers can assign themselves a custom role with the 'system: manage packages' permission and then upload and install a malicious PHP package through the admin package installer to achieve remote code execution.. EPSS estimates a 0.48% chance of exploitation in the next 30 days.