CVE-2026-55545

Medium

Description

Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs WebSocket subscription handlers fail to enforce the privileges required by equivalent REST endpoints. PacketsApi.subscribePackets exposes the packets WebSocket topic without ObjectPrivilegeType.ReadPacket, ProcessingApi.subscribeAlgorithmStatus exposes the algorithm-status WebSocket topic without ObjectPrivilegeType.ReadAlgorithm, and MdbOverrideApi.subscribeMdbChanges exposes the mdb-changes WebSocket topic without SystemPrivilege.GetMissionDatabase. A low-privilege authenticated user can receive telemetry packets, algorithm status, and mission database change information outside the assigned authorization scope. This issue is fixed in versions 5.12.8 and 5.13.2.

SeverityMedium

CVSS6.5

Exploit probability—

ProductOrg.yamcs:yamcs-core

PublishedAug 28, 2026

First seenAug 28, 2026

Weakness typeCWE-862Missing authorization

How to fix

Update

org.yamcs:yamcs-core5.12.8, 5.13.2 or later

Affected products

Product	Affected versions	Fixed in
org.yamcs:yamcs-coreMaven	v < 5.12.8, 5.13.0 ≤ v < 5.13.2	5.12.8, 5.13.2

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