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Yamcs团队的一款航天任务遥测数据管理软件。 Yamcs 5.12.0之前版本存在路径遍历漏洞，该漏洞源于StaticFileHandler.locateFile在解析未经身份验证的请求路径时未使用Path.normalize和Path.toAbsolutePath确认绝对路径位于配置的staticRoots内，可能导致路径遍历攻击，逃逸Web根目录并返回任意可读主机文件，泄露敏感操作系统和应用程序数据。
Possible ATT&CK Techniques 1 AI
T1006 · Direct Volume Access
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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
Vulnerability Title
Yamcs 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Yamcs是Yamcs团队的一款航天任务遥测数据管理软件。 Yamcs 5.12.0之前版本存在路径遍历漏洞，该漏洞源于StaticFileHandler.locateFile在解析未经身份验证的请求路径时未使用Path.normalize和Path.toAbsolutePath确认绝对路径位于配置的staticRoots内，可能导致路径遍历攻击，逃逸Web根目录并返回任意可读主机文件，泄露敏感操作系统和应用程序数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-55552
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Patches & Fixes for CVE-2026-55552 (2)
Vendor Advisories for CVE-2026-55552 (1)
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🔗 Unauthenticated Directory Traversal · Advisory · yamcs/yamcs · GitHub x_refsource_CONFIRM
Vendor Pages for CVE-2026-55552 (2)
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🔗 Release Yamcs 5.12.0 · yamcs/yamcs · GitHub x_refsource_MISC
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🔗 Release Yamcs 5.11.13 · yamcs/yamcs · GitHub x_refsource_MISC
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
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CVE-2026-55566
Yamcs: DOM XSS in Extension Routing -
CVE-2026-55565
Yamcs: Authenticated remote code execution via unescaped Str -
CVE-2026-55559
Yamcs: Remote Code Execution via instance-template argument -
CVE-2026-55549
Yamcs: Reflected XSS in the URL of the Authorize Endpoint -
CVE-2026-55547
Yamcs: Missing Authorization on Role and Privilege Enumerati
Same vendor: yamcs
-
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CVE-2026-55565
Yamcs: Authenticated remote code execution via unescaped Str -
CVE-2026-55559
Yamcs: Remote Code Execution via instance-template argument -
CVE-2026-55549
Yamcs: Reflected XSS in the URL of the Authorize Endpoint -
CVE-2026-55547
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Same weakness: CWE-22
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V. Comments for CVE-2026-55552
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