CVE-2026-53905: Mycomplianceoffice

High severity, CVSS 7.1. EPSS: 0.3% chance of exploitation in the next 30 days.

MCO does not properly enforce authorization checks in the /customer/servlet/mco/webapi/admin-view-hierarchy/get-acl-tree-structure endpoint. An authenticated, low-privileged user can retrieve administrator access control structures without proper authorization checks. This may expose sensitive permission mappings and internal configuration details. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.

Affected products

Published 2026-07-01. Last modified 2026-07-06.