Read the docs
TI-2026-32506 Aliases CVE-2026-44595GHSA-p2rj-mrmc-9w29

Yamcs: Unauthorized user enumeration via IAM API endpoints

Priority MEDIUM 53CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-862.

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01057 64th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed yamcs (yamcs): 5.12.7org.yamcs:yamcs-core (Maven): 5.12.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
yamcsyamcsbefore 5.12.75.12.7Patch availableCNA
—org.yamcs:yamcs-core (Maven)before 5.12.75.12.7Patch availableGHSA-p2rj-mrmc-9w29
  • yamcs Vendoryamcs Affected before 5.12.7 Fixed in 5.12.7 Patch available CNA
  • org.yamcs:yamcs-core (Maven) Vendor— Affected before 5.12.7 Fixed in 5.12.7 Patch available GHSA-p2rj-mrmc-9w29

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:spaceapplications:yamcs:*:*:*:*:*:*:*:*before 5.12.7Vulnerableyamcs
  • cpe:2.3:a:spaceapplications:yamcs:*:*:*:*:*:*:*:* Versions before 5.12.7 Vulnerable ·yamcs

Remediation

  • Fix · CNA yamcs (yamcs) Fixed in 5.12.7
  • Fix · GHSA-p2rj-mrmc-9w29 org.yamcs:yamcs-core (Maven) Fixed in 5.12.7 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-44595
  2. 2026-10-03 Alias added: GHSA-p2rj-mrmc-9w29

References

Exploit 1

Patch 2

Other 3

  • TI-2026-34240 Yamcs: Remote Code Execution via Mission Database algorithm override CVSS 3.1CRITICAL 9.8
  • TI-2026-32507 Yamcs: No Rate Limiting on Authentication Endpoint CVSS 3.1CRITICAL 9.8
  • TI-2026-34277 Yamcs: Authenticated Remote Code Execution (RCE) via Jython Algorithm Code Injection CVSS 3.1CRITICAL 9.1
  • TI-2026-32532 Yamcs: Server-Side Code Injection (RCE) via Janino Expression Engine in `JavaExprAlgorithmExecutionFactory` CVSS 3.1CRITICAL 9.1
  • TI-2026-40093 Yamcs: Insecure Direct Object Reference (IDOR) in PacketsApi allows unprivileged users to dump all telemetry packets CVSS 3.1MEDIUM 4.3
  • TI-2023-24268 Directory Traversal vulnerability in the storage functionality of the API in Yamcs 5.8.6… CVSS 3.1CRITICAL 9.1
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences