CVE-2026-55547
Yamcs: Missing Authorization on Role and Privilege Enumeration Endpoints Allows Any Authenticated User to Disclose Full Security Configuration
CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-285 CWE-862 |
| Vendor | yamcs |
| Product | yamcs |
| Published | Aug 28, 2026 |
| Last Updated | Aug 28, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
yamcs / yamcs
< 5.12.8 >= 5.13.0, < 5.13.2
References
github.com: https://github.com/yamcs/yamcs/security/advisories/GHSA-cvw4-55pp-3hfq github.com: https://github.com/yamcs/yamcs/commit/c2aec1c242e656e48b52c7f87deea88183bb592d github.com: https://github.com/yamcs/yamcs/commit/dcaec5f0b2f4231b8e313e94d79a937169c9e0ba github.com: https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8 github.com: https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2