CVE-2026-44595

Yamcs: Unauthorized user enumeration via IAM API endpoints

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

yamcs

CVSS v3.1 GITHUB

4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS

1.06% chance of exploitation in the next 30 days, 64th percentile

Published

2026-07-16

Updated

2026-07-18

Proof-of-concept exploits (1)

• ex-cal1bur/CVE-2026-445950★ · 2026-05-29

ExploitDB entries (1)

• https://www.exploit-db.com/exploits/52604

Security advisories

• yamcs/yamcs/security/advisories/GHSA-p2rj-mrmc-9w29
• advisories/GHSA-p2rj-mrmc-9w29
• yamcs/yamcs/commit/0e12b518f103f24681299318a30a460fe4327b88

References

• CVE Record
• NVD entry

Related

• CVE-2025-24071
• CVE-2026-42568
• CVE-2026-44596