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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| yamcs | yamcs | < 5.12.7 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- YAMCS yamcs-core 5.12.7 - User Enumeration EDB-52604 · webapps · May 30, 2026
GitHub 1 repository
-
ex-cal1bur/CVE-2026-44595 ★ 0 · May 29, 2026
# CVE-2026-44595 YAMCS Unauthorized User Enumeration via IAM API
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.yamcs:yamcs-core | < 5.12.7 | 5.12.7 | GHSA-p2rj-mrmc-9w29 |
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