Medium severity4.3GHSA Advisory· Published Aug 28, 2026· Updated Sep 8, 2026
CVE-2026-55547
CVE-2026-55547
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
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
org.yamcs:yamcs-coreMaven | >= 5.13.0, < 5.13.2 | 5.13.2 |
org.yamcs:yamcs-coreMaven | < 5.12.8 | 5.12.8 |
Affected products
1Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-cvw4-55pp-3hfqghsaADVISORY
- github.com/yamcs/yamcs/commit/c2aec1c242e656e48b52c7f87deea88183bb592dnvdWEB
- github.com/yamcs/yamcs/commit/dcaec5f0b2f4231b8e313e94d79a937169c9e0banvdWEB
- github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8nvdWEB
- github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2nvdWEB
- github.com/yamcs/yamcs/security/advisories/GHSA-cvw4-55pp-3hfqnvdWEB
News mentions
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