CVE-2026-44595
Medium · 4.3Yamcs vulnerable to unauthorized user enumeration via IAM API endpoints
CVSS
4.3
EPSS
1.1%
Published
May 27, 2026
CISA due date
—
The record
The IAM API endpoints (`listUsers`, `getUser`, `listGroups`, and `getGroup`) in `yamcs-core` do not enforce the required `SystemPrivilege.ControlAccess` check. As a result, **any authenticated user** (even those with low or no privileges) can enumerate all user accounts in the system, including their usernames, superuser status, and group memberships. This constitutes a broken access control vulnerability (CWE-862) that leaks sensitive user information.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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