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Vulnerability record · CVE-2026-55521 · published 28 August 2026

CVE-2026-55521: Missing authorization vulnerability

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 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.

8.8 CVSS 3.1 High EPSS 0.52% · top 57.9% CWE-862 · Missing authorization Awaiting Analysis
8.8CVSS 3.1 base score
0.52%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
8 Sep 2026Last modified by NVD

Description

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 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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/yamcs/yamcs/commit/405139afa6094dfaf63ac17f32df1f808846c950
https://github.com/yamcs/yamcs/commit/493563679f838b86f3cdc5da9451d4a050ff6bd9
https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8
https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2
https://github.com/yamcs/yamcs/security/advisories/GHSA-962x-ccwf-8x6p
https://github.com/yamcs/yamcs/security/advisories/GHSA-962x-ccwf-8x6p

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Source: NIST National Vulnerability Database (record CVE-2026-55521), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.