CVE-2026-44595: Spaceapplications Yamcs

Medium severity, CVSS 4.3. EPSS: 1.1% chance of exploitation in the next 30 days.

Yamcs is a mission control framework. Prior to 5.12.7, the IAM API endpoints listUsers, getUser, listGroups, and getGroup in yamcs-core did not enforce the required SystemPrivilege.ControlAccess check in yamcs-core/src/main/java/org/yamcs/http/api/IamApi.java, so any authenticated user, even one with low or no privileges, could enumerate all user accounts in the system including their usernames, superuser status, and group memberships. This issue is fixed in versions 5.12.7 and 5.13.0.

Affected products

• Spaceapplications Yamcs: before 5.12.7 (fixed in 5.12.7)

Published 2026-07-16. Last modified 2026-07-18.