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Vulnerability · Published Aug 28, 2026 · Assigned by GitHub_M

CVE-2026-55547Yamcs: Missing Authorization on Role and Privilege Enumeration Endpoints Allows Any Authenticated User to Disclose Full Security Configuration

Medium 4.3

In plain English

A medium-severity missing authorization in yamcs from yamcs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.3%top 72.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Mavenorg.yamcs:yamcs-core5.13.2GHSA-cvw4-55pp-3hfq
Mavenorg.yamcs:yamcs-core5.12.8GHSA-cvw4-55pp-3hfq

Affected products (as reported)

VendorProductVersions
yamcs yamcs < 5.12.8>= 5.13.0, < 5.13.2

Weakness: CWE-285, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References