---
id: CVE-2026-55521
title: Yamcs is a mission control framework
summary: >-
  Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs omits
  authorization checks in IndexesApi.listPacketIndex, IndexesApi.listEventIndex,
  Cop1Api.disable, Cop1Api.resume, Cop1Api.initialize, Cop1Api.updateConfig, and
  T…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-862
vendor: yamcs
product: 'org.yamcs:yamcs-core'
affected:
  - 'org.yamcs:yamcs-core >= 5.13.0, <= 5.13.1'
  - 'org.yamcs:yamcs-core <= 5.12.7'
patched:
  - 'org.yamcs:yamcs-core 5.13.2'
  - 'org.yamcs:yamcs-core 5.12.8'
published: '2026-08-28'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T21:08:37.320'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55521'
references:
  - url: >-
      https://github.com/yamcs/yamcs/commit/405139afa6094dfaf63ac17f32df1f808846c950
    label: security-advisories@github.com
  - url: >-
      https://github.com/yamcs/yamcs/commit/493563679f838b86f3cdc5da9451d4a050ff6bd9
    label: security-advisories@github.com
  - url: 'https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8'
    label: security-advisories@github.com
  - url: 'https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2'
    label: security-advisories@github.com
  - url: 'https://github.com/yamcs/yamcs/security/advisories/GHSA-962x-ccwf-8x6p'
    label: security-advisories@github.com
  - url: 'https://github.com/yamcs/yamcs/security/advisories/GHSA-962x-ccwf-8x6p'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-962x-ccwf-8x6p'
tags:
  - nvd
  - ghsa
  - maven
epss: 0.00523
epssPercentile: 0.41967
aliases:
  - GHSA-962x-ccwf-8x6p
ecosystem: maven
ingestedAt: '2026-08-28T17:22:56.282Z'
---

## Overview

Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs omits authorization checks in IndexesApi.listPacketIndex, IndexesApi.listEventIndex, Cop1Api.disable, Cop1Api.resume, Cop1Api.initialize, Cop1Api.updateConfig, and TimeApi.setTime. An authenticated low-privilege user can read packet and event index metadata without ObjectPrivilegeType.ReadPacket, alter COP-1 link state without SystemPrivilege.ControlLinks, and manipulate simulation time. These operations can disclose telemetry metadata, disrupt telecommand handling, and affect system integrity and availability. This issue is fixed in versions 5.12.8 and 5.13.2.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55521)

Affected packages:

- `org.yamcs:yamcs-core >= 5.13.0, <= 5.13.1`
- `org.yamcs:yamcs-core <= 5.12.7`

Patched in:

- `org.yamcs:yamcs-core 5.13.2`
- `org.yamcs:yamcs-core 5.12.8`

Source: https://github.com/advisories/GHSA-962x-ccwf-8x6p