---
id: CVE-2026-55547
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
  SystemPrivilege.ControlAccess checks from IamApi.listRoles, IamApi.getRole,
  and IamApi.listPrivileges in
  yamcs-core/src/main/java/org/yamcs/http/api/IamApi.jav…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-285
  - 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-2026-55547'
references:
  - url: >-
      https://github.com/yamcs/yamcs/commit/c2aec1c242e656e48b52c7f87deea88183bb592d
    label: security-advisories@github.com
  - url: >-
      https://github.com/yamcs/yamcs/commit/dcaec5f0b2f4231b8e313e94d79a937169c9e0ba
    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-cvw4-55pp-3hfq'
    label: security-advisories@github.com
  - url: 'https://github.com/yamcs/yamcs/security/advisories/GHSA-cvw4-55pp-3hfq'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-cvw4-55pp-3hfq'
tags:
  - nvd
  - ghsa
  - maven
epss: 0.00342
epssPercentile: 0.24951
aliases:
  - GHSA-cvw4-55pp-3hfq
ecosystem: maven
ingestedAt: '2026-08-28T17:22:56.196Z'
---

## Overview

Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs omits SystemPrivilege.ControlAccess checks from IamApi.listRoles, IamApi.getRole, and IamApi.listPrivileges in yamcs-core/src/main/java/org/yamcs/http/api/IamApi.java. Any authenticated account can call GET /api/roles, GET /api/roles/{name}, and GET /api/privileges to enumerate available system privileges and configured role mappings. The disclosure reveals security configuration that can support targeted privilege-escalation attempts. 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-2026-55547)

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-cvw4-55pp-3hfq