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CVE-2026-44595

MediumPublished

Yamcs: Unauthorized user enumeration via IAM API endpoints

Published: Jul 16, 2026
Updated: Jul 18, 2026
Assigning CNA: GitHub_M
Evidence observed: May 30, 2026

Primary CVSS

4.3/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

1.1%

Low · next 30 days

Percentile: 62.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-44595PoC
# CVE-2026-44595 YAMCS Unauthorized User Enumeration via IAM API
YAMCS yamcs-core 5.12.7 - User EnumerationExploit
Daniel Miranda · multiple · May 30, 2026

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