CVE-2026-57518

Description

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.

References

• https://gist.github.com/sermikr0/6f0a67e9d101746fcdb04827de137847
• https://www.vulncheck.com/advisories/pagekit-cms-privilege-escalation-via-userapicontroller