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CVE-2026-55566— Yamcs: DOM XSS in Extension Routing

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 之前的版本中，Yamcs 在处理来自 URL 路由的攻击者可控数据时，在通过 进行 DOM 渲染之前，未先检查已注册的插件 ID。相关的处理代码位于 、 和 。攻击者可以构造一个恶意 URL，当用户打开该 URL 时，其中内嵌的 JavaScript 代码将被执行。该脚本能够读取 Yamcs Web 应用中可用的数据，并在用户的上下文中执行操作。此问题已在版本 5.12.8 和 5.13.2 中修复。

CVSS 4.3 · Medium

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

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-2026-55566

Vulnerability Information
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Vulnerability Title
Yamcs: DOM XSS in Extension Routing
Source: CVE Program / CVE List V5
Vulnerability Description
Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs processes attacker-controlled data from the /ext URL route in yamcs-web/src/main/webapp/projects/webapp/src/app/core/routes/extension.matcher.ts, extension.component.ts, and app.component.ts without checking registered plugin IDs before DOM rendering through innerHTML. A crafted URL can execute JavaScript when opened by a user. The script can read data available to the Yamcs web application and perform actions in the user context. 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:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
yamcs yamcs < 5.12.8 -

II. Public POCs for CVE-2026-55566

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-55566

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Patches & Fixes for CVE-2026-55566 (2)

Vendor Advisories for CVE-2026-55566 (1)

Vendor Pages for CVE-2026-55566 (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-2026-55545 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

IV. Related Vulnerabilities

Same product: yamcs
Same vendor: yamcs
Same weakness: CWE-79

V. Comments for CVE-2026-55566

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