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OpenAdvisories
High · 8.8 CVE-2026-55521 EUVD-2026-67838GHSA-962x-ccwf-8x6p

Yamcs : Multiple Missing Function Level Access Control vulnerabilities in Yamcs Core API

Published Aug 28, 2026 · Updated Aug 28, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
yamcs yamcs < 5.12.8, >= 5.13.0, < 5.13.2 —

Affected packages

EcosystemPackageAffectedFixedRecord
Maven org.yamcs:yamcs-core >= 5.13.0, < 5.13.2 5.13.2 GHSA-962x-ccwf-8x6p
Maven org.yamcs:yamcs-core < 5.12.8 5.12.8 GHSA-962x-ccwf-8x6p

References