Medium 4.3Published Jul 16, 2026

CVE-2026-44595Yamcs: Unauthorized user enumeration via IAM API endpoints

Updated under an hour ago (Oct 25, 2026, 9:23 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for yamcs

Exploited in the last 30 days

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.

CVSS: 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Jul 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

yamcs yamcs yamcs:yamcs (from the name)	before 5.12.7	CNA record
spaceapplications yamcs spaceapplications:yamcs	before 5.12.7	NVD

References

https://github.com/yamcs/yamcs/security/advisories/GHSA-p2rj-mrmc-9w29x-refsource-confirm, exploit, vendor-advisory
https://github.com/yamcs/yamcs/commit/0e12b518f103f24681299318a30a460fe4327b88x-refsource-misc, patch
https://github.com/yamcs/yamcs/commit/e90099fba98e96214217c195b6a5b87b5f46e51cx-refsource-misc, patch
https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.7x-refsource-misc, release-notes
https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.0x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.