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Advisory record · GHSA-p2rj-mrmc-9w29

Yamcs vulnerable to unauthorized user enumeration via IAM API endpoints

CVSS 4.3 MediumEPSS 0.011 · 64th percentile

Published by the GitHub Advisory Database at 27 May 2026, 00:03 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.yamcs:yamcs-coreMaven<5.12.75.12.7
Identifiers
GHSA-p2rj-mrmc-9w29 · CVE-2026-44595
Weakness (CWE)
CWE-862
Tags
Published
27 May 2026
Updated
27 May 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Yamcs (org.yamcs:yamcs-core, Maven) versions before 5.12.7 are affected. The IAM API endpoints that list users and groups, and return a user's details, do not check for the ControlAccess system privilege, so any authenticated user, including those with low or no privileges, can list user accounts, their superuser status, and group memberships. Upgrade to yamcs-core 5.12.7 or later. The source gives no workaround.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
4.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.011, the 64th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:20 UTC First seen by agentprime
  2. 31 Oct 2026, 14:20 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.