CVE-2026-45334 Kirby: Content locks disclose IDs and emails of inaccessible users from `users.access/list` permissions

Kirby is an open-source content management system. In versions prior to 4.9.1 and 5.4.1, the content-locking feature returned lock information without checking the requesting user's access permissions. Kirby's Panel includes a content-locking feature that records which user currently has a model...

CVE-2026-45334

Kirby CMS (versions < 4.9.1 and

Kirby CMS's content locks disclose IDs and emails of inaccessible users from `users.access/list` permissions

TL;DR This vulnerability affects all Kirby sites that restrict the visibility of users for certain roles via the users.access or users.list permissions. A site is affected if users of a particular role are not allowed to see other users in the Panel, for example because the role's blueprint sets...

GHSA-39VQ-49QM-R2MC Kirby CMS's content locks disclose IDs and emails of inaccessible users from `users.access/list` permissions

TL;DR This vulnerability affects all Kirby sites that restrict the visibility of users for certain roles via the users.access or users.list permissions. A site is affected if users of a particular role are not allowed to see other users in the Panel, for example because the role's blueprint sets...