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CVE-2026-55552— Yamcs: Unauthenticated Directory Traversal

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 5.11.13 版本之前，Yamcs 的 StaticFileHandler.locateFile 方法在处理未认证的请求路径时，未使用 和 来验证绝对路径是否仍位于已配置的 目录内。如果路径中包含路径遍历（traversal）片段，攻击者可以逃逸出预期的 Web 根目录，从而返回服务器上任意可读文件的内容。该缺陷位于 文件中，可能导致敏感的操作系统和应用程序数据泄露。此问题已在 5.11.13 版本中修复，而 5.12 系列则从 5.12.0 版本起得到修复。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1006 · Direct Volume Access

Affected Version Matrix 1

VendorProduct Version RangeStatus
yamcs yamcs < 5.12.0 affected
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I. Basic Information for CVE-2026-55552

Vulnerability Information
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Vulnerability Title
Yamcs: Unauthenticated Directory Traversal
Source: CVE Program / CVE List V5
Vulnerability Description
Yamcs is a mission control framework. Prior to 5.11.13, Yamcs StaticFileHandler.locateFile resolves an unauthenticated request path without using Path.normalize and Path.toAbsolutePath to confirm that the absolute path remains within the configured staticRoots. A path containing traversal segments can escape the intended web root and return an arbitrary readable host file. The flaw is in yamcs-core/src/main/java/org/yamcs/http/StaticFileHandler.java and can disclose sensitive operating-system and application data. This issue is fixed in version 5.11.13, and the 5.12 line is fixed from version 5.12.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
yamcs yamcs < 5.12.0 -

II. Public POCs for CVE-2026-55552

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III. Intelligence Information for CVE-2026-55552

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Patches & Fixes for CVE-2026-55552 (2)

Vendor Advisories for CVE-2026-55552 (1)

Vendor Pages for CVE-2026-55552 (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-2026-55545 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-22

V. Comments for CVE-2026-55552

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