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CVE-2026-55521— Yamcs : Multiple Missing Function Level Access Control vulnerabilities in Yamcs Core API

Quick assessment

Affected
yamcs yamcs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Yamcs 是一个任务控制框架。在 5.12.8 和 5.13.2 版本之前，Yamcs 在以下 API 中遗漏了权限验证检查：IndexesApi.listPacketIndex、IndexesApi.listEventIndex、Cop1Api.disable、Cop1Api.resume、Cop1Api.initialize、Cop1Api.updateConfig 和 TimeApi.setTime。 一个已认证的、权限较低的用户可以： 在缺少 ObjectPrivilegeType.ReadPacket

CVSS 8.8 · High

Affected Version Matrix 2

VendorProduct Version RangeStatus
yamcs yamcs < 5.12.8 affected
>= 5.13.0, < 5.13.2 affected
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I. Basic Information for CVE-2026-55521

Vulnerability Information
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Vulnerability Title
Yamcs : Multiple Missing Function Level Access Control vulnerabilities in Yamcs Core API
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
yamcs yamcs < 5.12.8 -

II. Public POCs for CVE-2026-55521

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III. Intelligence Information for CVE-2026-55521

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Patches & Fixes for CVE-2026-55521 (2)

Vendor Advisories for CVE-2026-55521 (1)

Vendor Pages for CVE-2026-55521 (2)

Same Patch Batch · yamcs · 2026-08-28 · 9 CVEs total

CVE-2026-55565 9.9 CRITICAL Yamcs: Authenticated remote code execution via unescaped StreamSQL `LIKE` pattern compiled
CVE-2026-55559 9.8 CRITICAL Yamcs: Remote Code Execution via instance-template argument YAML injection (createInstance
CVE-2026-55511 9.1 CRITICAL Yamcs: Authenticated RCE via StreamSQL aggregate-compiler column-name injection in Yamcs `
CVE-2026-55552 7.5 HIGH Yamcs: Unauthenticated Directory Traversal
CVE-2026-55545 6.5 MEDIUM Yamcs: WebSocket subscription handlers omit the privilege checks their REST siblings enfor
CVE-2026-55549 6.5 MEDIUM Yamcs: Reflected XSS in the URL of the Authorize Endpoint
CVE-2026-55547 4.3 MEDIUM Yamcs: Missing Authorization on Role and Privilege Enumeration Endpoints Allows Any Authen
CVE-2026-55566 4.3 MEDIUM Yamcs: DOM XSS in Extension Routing

IV. Related Vulnerabilities

Same product: yamcs
Same vendor: yamcs
Same weakness: CWE-862

V. Comments for CVE-2026-55521

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