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CVE-2026-55547 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:4.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/yamcs/yamcs/security/advisories/GHSA-cvw4-55pp-3hfq	CISA-ADP
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]

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-285	Improper Authorization	[email protected]
CWE-862	Missing Authorization	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Aug 28, 2026	CVE Modified	CISA-ADP
Aug 28, 2026	New CVE Received	[email protected]