Yamcs: Unauthorized user enumeration via IAM API endpoints (yamcs yamcs)
At a glance
- Source
- NVD
- EPSS
- EPSS 1.06 % · percentile 64 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Modified
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.
Weaknesses (CWE)
- CWE-862 — Missing Authorization
References
- https://github.com/yamcs/yamcs/security/advisories/GHSA-p2rj-mrmc-9w29
- 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
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N | GitHub_M |
| CVSS 3.1 | MEDIUM 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N | NVD · security-advisories@github.com (Secondary) |
Advisories
- GHSA-p2rj-mrmc-9w29 — Yamcs vulnerable to unauthorized user enumeration via IAM API endpoints
European references
- ENISA EUVD · EUVD-2026-44954
- GCVE · GCVE-0-2026-44595
Affected configurations (NVD CPE)
cpe:2.3:a:spaceapplications:yamcs:*:*:*:*:*:*:*:*< 5.12.7
Affected products
| Product | Versions |
|---|---|
| yamcs · yamcs | affected < 5.12.7 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |