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CVE-2026-55545— Yamcs: WebSocket subscription handlers omit the privilege checks their REST siblings enforce

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 的 WebSocket 订阅处理程序未能强制执行等效 REST 端点所需权限。具体表现为： 在未验证 权限的情况下公开了数据包 WebSocket 主题； 在未验证 权限的情况下公开了算法状态 WebSocket 主题； 在未验证 权限的情况下公开了 MDB 变更 WebSocket 主题。因此，低权限的已认证用户可以接收超出其授权范围的遥测数据包、算法状态及任务数据库变更信息。该问题已在 5.12.8 和 5.13.2 版本

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1212 · Exploitation for Credential Access

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-2026-55545

Vulnerability Information
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Vulnerability Title
Yamcs: WebSocket subscription handlers omit the privilege checks their REST siblings enforce
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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-2026-55545

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III. Intelligence Information for CVE-2026-55545

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Patches & Fixes for CVE-2026-55545 (2)

Vendor Advisories for CVE-2026-55545 (1)

Vendor Pages for CVE-2026-55545 (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-2026-55521 8.8 HIGH Yamcs : Multiple Missing Function Level Access Control vulnerabilities in Yamcs Core API
CVE-2026-55552 7.5 HIGH Yamcs: Unauthenticated Directory Traversal
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-2026-55545

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