CVE-2026-44595 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-44595MEDIUM

Yamcs: Unauthorized user enumeration via IAM API endpoints

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  L  N  N    4.3   .0098   59.6     —

AFFECTED
  Product  Versions    Fixed
  yamcs    < 5.12.7 –  —

TIMELINE
  May 6   Reserved by GitHub_M
  Jul 16  EXPLOIT PUBLISHED — CVE-2026-44595 (yamcs). Public exploit reference added.
  Jul 16  Published (CNA: GitHub_M)

CWE-862 · CNA: GitHub_M · CVSS v3.1 · 5 references · NVD status: Modified

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
May 6, 2026	Reserved	Reserved by GitHub_M
July 16, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-44595 (yamcs). Public exploit reference added.
July 16, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
yamcs	yamcs	—	< 5.12.7	—

Weaknesses

CWE-862

References (5)

https://github.com/yamcs/yamcs/commit/0e12b518f103f24681299318a30a460fe4327b88 [Patch]
https://github.com/yamcs/yamcs/commit/e90099fba98e96214217c195b6a5b87b5f46e51c [Patch]
https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.7 [Release Notes]
https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.0 [Release Notes]
https://github.com/yamcs/yamcs/security/advisories/GHSA-p2rj-mrmc-9w29 [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-44595 at cve.org

Vendors: yamcs

Weaknesses: CWE-862

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-44595 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.