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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55521
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 20:18:28 UTC
Updated2026-09-08 21:08:37 UTC
DescriptionYamcs 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

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

EPSS: 0.003610000 probability, percentile 0.291920000 (date 2026-09-08)

Problem Types: CWE-862 | CWE-862 CWE-862: Missing Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Yamcs Yamcs affected < 5.12.8 Not specified
CNA Yamcs Yamcs affected >= 5.13.0, < 5.13.2 Not specified

References

ReferenceSourceLinkTags
github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2 [email protected] github.com
github.com/yamcs/yamcs/commit/405139afa6094dfaf63ac17f32df1f808846c950 [email protected] github.com
github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8 [email protected] github.com
github.com/yamcs/yamcs/commit/493563679f838b86f3cdc5da9451d4a050ff6bd9 [email protected] github.com
github.com/yamcs/yamcs/security/advisories/GHSA-962x-ccwf-8x6p 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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