CVE-2026-55547CWE-285CWE-862broken-access-control

CVE-2026-55547

Medium · published August 29, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
26.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00342 · 26.5th percentile
Weaknesses
CWE-285 · Improper Authorization; CWE-862 · Missing Authorization
Published
2026-08-29T00:18Z
References (6)
https://github.com/yamcs/yamcs/commit/c2aec1c242e656e48b52c7f87deea88183bb592d · [email protected]https://github.com/yamcs/yamcs/commit/dcaec5f0b2f4231b8e313e94d79a937169c9e0ba · [email protected]https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8 · [email protected]https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2 · [email protected]https://github.com/yamcs/yamcs/security/advisories/GHSA-cvw4-55pp-3hfq · [email protected]https://github.com/yamcs/yamcs/security/advisories/GHSA-cvw4-55pp-3hfq · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 30 AUG 16:18Z
    EPSS moved — → 0%
    epss
  • 28 AUG 17:11Z
    Yamcs: Missing Authorization on Role and Privilege Enumeration Endpoints Allows Any Authenticated User to Disclose Full Security Configuration
    cvelistv5