Is CVE-2026-44595 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-44595?

CVE-2026-44595 has a CVSS v3 severity of MEDIUM (4.3).

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CVE-2026-44595

Description

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.