Vulnerability Details CVE-2026-44595
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.
Exploit prediction scoring system (EPSS) score
CVSS Severity
CVSS v3 Score 4.3
References
- https://github.com/yamcs/yamcs/commit/0e12b518f103f24681299318a30a460fe4327b88
- https://github.com/yamcs/yamcs/commit/e90099fba98e96214217c195b6a5b87b5f46e51c
- https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.7
- https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.0
- https://github.com/yamcs/yamcs/security/advisories/GHSA-p2rj-mrmc-9w29