{"id":"CVE-2026-55521","title":"Yamcs is a mission control framework","summary":"Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs omits authorization checks in IndexesApi.listPacketIndex, IndexesApi.listEventIndex, Cop1Api.disable, Cop1Api.resume, Cop1Api.initialize, Cop1Api.updateConfig, and T…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-862"],"vendor":"yamcs","product":"org.yamcs:yamcs-core","affected":["org.yamcs:yamcs-core >= 5.13.0, <= 5.13.1","org.yamcs:yamcs-core <= 5.12.7"],"patched":["org.yamcs:yamcs-core 5.13.2","org.yamcs:yamcs-core 5.12.8"],"published":"2026-08-28","updated":"2026-09-08","sourceUpdated":"2026-09-08T21:08:37.320","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55521","references":[{"url":"https://github.com/yamcs/yamcs/commit/405139afa6094dfaf63ac17f32df1f808846c950","label":"security-advisories@github.com"},{"url":"https://github.com/yamcs/yamcs/commit/493563679f838b86f3cdc5da9451d4a050ff6bd9","label":"security-advisories@github.com"},{"url":"https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8","label":"security-advisories@github.com"},{"url":"https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2","label":"security-advisories@github.com"},{"url":"https://github.com/yamcs/yamcs/security/advisories/GHSA-962x-ccwf-8x6p","label":"security-advisories@github.com"},{"url":"https://github.com/yamcs/yamcs/security/advisories/GHSA-962x-ccwf-8x6p","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/advisories/GHSA-962x-ccwf-8x6p"}],"tags":["nvd","ghsa","maven"],"epss":0.00523,"epssPercentile":0.41885,"aliases":["GHSA-962x-ccwf-8x6p"],"ecosystem":"maven","ingestedAt":"2026-08-28T17:22:56.282Z","slug":"CVE-2026-55521","body":"## Overview\n\nYamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs omits authorization checks in IndexesApi.listPacketIndex, IndexesApi.listEventIndex, Cop1Api.disable, Cop1Api.resume, Cop1Api.initialize, Cop1Api.updateConfig, and TimeApi.setTime. An authenticated low-privilege user can read packet and event index metadata without ObjectPrivilegeType.ReadPacket, alter COP-1 link state without SystemPrivilege.ControlLinks, and manipulate simulation time. These operations can disclose telemetry metadata, disrupt telecommand handling, and affect system integrity and availability. This issue is fixed in versions 5.12.8 and 5.13.2.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-55521)\n\nAffected packages:\n\n- `org.yamcs:yamcs-core >= 5.13.0, <= 5.13.1`\n- `org.yamcs:yamcs-core <= 5.12.7`\n\nPatched in:\n\n- `org.yamcs:yamcs-core 5.13.2`\n- `org.yamcs:yamcs-core 5.12.8`\n\nSource: https://github.com/advisories/GHSA-962x-ccwf-8x6p","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}