---
id: CVE-2026-55566
title: Yamcs is a mission control framework
summary: >-
  Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs
  processes attacker-controlled data from the /ext URL route in
  yamcs-web/src/main/webapp/projects/webapp/src/app/core/routes/extension.matcher.ts,
  extension.component…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N'
cwe:
  - CWE-79
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-2026-55566'
references:
  - url: >-
      https://github.com/yamcs/yamcs/commit/8e18e279d8ce761c21f4f67bbd06a1bff804d297
    label: security-advisories@github.com
  - url: >-
      https://github.com/yamcs/yamcs/commit/ecf34a4e2ccbe085e6ceff0253595b24d5ecb4aa
    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-9272-wg2r-7xmx'
    label: security-advisories@github.com
  - url: 'https://github.com/yamcs/yamcs/security/advisories/GHSA-9272-wg2r-7xmx'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-9272-wg2r-7xmx'
tags:
  - nvd
  - ghsa
  - maven
epss: 0.0038
epssPercentile: 0.29281
aliases:
  - GHSA-9272-wg2r-7xmx
ecosystem: maven
ingestedAt: '2026-08-28T18:23:37.922Z'
---

## Overview

Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs processes attacker-controlled data from the /ext URL route in yamcs-web/src/main/webapp/projects/webapp/src/app/core/routes/extension.matcher.ts, extension.component.ts, and app.component.ts without checking registered plugin IDs before DOM rendering through innerHTML. A crafted URL can execute JavaScript when opened by a user. The script can read data available to the Yamcs web application and perform actions in the user context. 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-2026-55566)

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-9272-wg2r-7xmx