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Advisory record · GHSA-962x-ccwf-8x6p

Yamcs Core API has Multiple Missing Function Level Access Control vulnerabilities

CVSS 8.8 HighEPSS 0.0052 · 44th percentile

Published by the GitHub Advisory Database at 28 Aug 2026, 17:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.yamcs:yamcs-coreMaven>=5.13.0, <5.13.2 || <5.12.85.13.2, 5.12.8
Identifiers
GHSA-962x-ccwf-8x6p · CVE-2026-55521
Weakness (CWE)
CWE-862
Tags
Published
28 Aug 2026
Updated
28 Aug 2026

Machine-written summary

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

Yamcs Core (org.yamcs:yamcs-core) versions 5.13.0 before 5.13.2 and before 5.12.8 are affected. Any authenticated user, including one with no assigned roles, can bypass missing function-level access checks in several REST API endpoints to read historical packet and event index metadata, disable the COP-1 telecommand protocol, or change the simulation time. Upgrade to version 5.13.2 or 5.12.8.

Written 2 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
8.8 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0052, the 44th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:19 UTC First seen by agentprime
  2. 31 Oct 2026, 14:19 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.