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.
Affected products
spaceapplications: yamcs
References6
- github.com/yamcs/yamcs/security/advisories/GHSA-p2rj-mrmc-9w29 ExploitVendor Advisory
- github.com/yamcs/yamcs/security/advisories/GHSA-p2rj-mrmc-9w29 ExploitVendor Advisory
- github.com/yamcs/yamcs/commit/0e12b518f103f24681299318a30a460fe… Patch
- github.com/yamcs/yamcs/commit/e90099fba98e96214217c195b6a5b87b5… Patch
- github.com/yamcs/yamcs/releases/tag/yamcs-5.12.7 Release Notes
- github.com/yamcs/yamcs/releases/tag/yamcs-5.13.0 Release Notes
Metrics
- CVSS 3.1
-
4.3
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N - EPSS — exploit probability
- 1% percentile: 65 · as of 15 November 2026
- CWE
- CWE-862
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