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CVE-2026-6807— NSA GRASSMARLIN Improper Restriction of XML External Entity Reference

Quick assessment

Affected
NSA GRASSMARLIN
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.

GRASSMARLIN是NSA Cybersecurity Directorate开源的一款工业控制系统网络安全态势感知工具。 GRASSMARLIN v3.2.1版本存在代码问题漏洞，该漏洞源于XML解析过程加固不足，可能导致特制的会话数据触发对XML输入的不当处理，造成敏感信息意外泄露。

CVSS 5.5 · Medium EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
NSA GRASSMARLIN All versions affected
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I. Basic Information for CVE-2026-6807

Vulnerability Information
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Vulnerability Title
NSA GRASSMARLIN Improper Restriction of XML External Entity Reference
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in GRASSMARLIN v3.2.1 allows crafted session data to trigger improper handling of XML input, which may result in unintended exposure of sensitive information. The flaw stems from insufficient hardening of the XML parsing process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
XML外部实体引用的不恰当限制(XXE)
Source: CVE Program / CVE List V5
Vulnerability Title
GRASSMARLIN 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GRASSMARLIN是NSA Cybersecurity Directorate开源的一款工业控制系统网络安全态势感知工具。 GRASSMARLIN v3.2.1版本存在代码问题漏洞，该漏洞源于XML解析过程加固不足，可能导致特制的会话数据触发对XML输入的不当处理，造成敏感信息意外泄露。
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

Vendor Product Affected Versions CPE Subscribe
NSA GRASSMARLIN All versions -

II. Public POCs for CVE-2026-6807

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III. Intelligence Information for CVE-2026-6807

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Vendor Advisories for CVE-2026-6807 (2)

IV. Related Vulnerabilities

Same vendor: NSA
Same weakness: CWE-611

V. Comments for CVE-2026-6807

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