{"id":"CVE-2026-55547","state":"PUBLISHED","title":"Yamcs: Missing Authorization on Role and Privilege Enumeration Endpoints Allows Any Authenticated User to Disclose Full Security Configuration","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.","publishedAt":"2026-08-28T17:11:34.332Z","updatedAt":"2026-08-28T20:30:11.670Z","severity":{"score":4.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["yamcs yamcs"],"affected":[{"vendor":"yamcs","product":"yamcs","versions":[{"version":"< 5.12.8","status":"affected"},{"version":">= 5.13.0, < 5.13.2","status":"affected"}]}],"references":["https://github.com/yamcs/yamcs/security/advisories/GHSA-cvw4-55pp-3hfq","https://github.com/yamcs/yamcs/commit/c2aec1c242e656e48b52c7f87deea88183bb592d","https://github.com/yamcs/yamcs/commit/dcaec5f0b2f4231b8e313e94d79a937169c9e0ba","https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8","https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2"],"weaknesses":["CWE-285","CWE-862"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55547.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55547","state":"PUBLISHED","datePublished":"2026-08-28T17:11:34.332Z","dateUpdated":"2026-08-28T20:30:11.670Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-16T23:01:04.075Z"},"containers":{"cna":{"title":"Yamcs: Missing Authorization on Role and Privilege Enumeration Endpoints Allows Any Authenticated User to Disclose Full Security Configuration","descriptions":[{"lang":"en","value":"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":[{"vendor":"yamcs","product":"yamcs","versions":[{"version":"< 5.12.8","status":"affected"},{"version":">= 5.13.0, < 5.13.2","status":"affected"}]}],"references":[{"url":"https://github.com/yamcs/yamcs/security/advisories/GHSA-cvw4-55pp-3hfq","name":"https://github.com/yamcs/yamcs/security/advisories/GHSA-cvw4-55pp-3hfq","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/yamcs/yamcs/commit/c2aec1c242e656e48b52c7f87deea88183bb592d","name":"https://github.com/yamcs/yamcs/commit/c2aec1c242e656e48b52c7f87deea88183bb592d","tags":["x_refsource_MISC"]},{"url":"https://github.com/yamcs/yamcs/commit/dcaec5f0b2f4231b8e313e94d79a937169c9e0ba","name":"https://github.com/yamcs/yamcs/commit/dcaec5f0b2f4231b8e313e94d79a937169c9e0ba","tags":["x_refsource_MISC"]},{"url":"https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8","name":"https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8","tags":["x_refsource_MISC"]},{"url":"https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2","name":"https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-285","lang":"en","description":"CWE-285: Improper Authorization","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-862","lang":"en","description":"CWE-862: Missing Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-28T17:11:34.332Z"},"source":{"advisory":"GHSA-cvw4-55pp-3hfq","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/yamcs/yamcs/security/advisories/GHSA-cvw4-55pp-3hfq","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-28T20:29:51.716854Z","id":"CVE-2026-55547","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-28T20:30:11.670Z"}}]}}}