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CVE-2026-35571— Emissary has Stored XSS via Navigation Template Link Injection

Quick assessment

Affected
NationalSecurityAgency emissary
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.

Emissary是National Security Agency开源的一个分布式 P2P 数据驱动工作流框架。 Emissary 8.39.0之前版本存在跨站脚本漏洞，该漏洞源于Mustache导航模板将配置控制的链接值直接插入href属性而未进行URL方案验证，可能导致能够修改navItems配置的管理员注入javascript: URI，从而对其他经过身份验证的用户实施存储型跨站脚本攻击。

CVSS 4.8 · Medium EPSS 0.26% · P16
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I. Basic Information for CVE-2026-35571

Vulnerability Information
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Vulnerability Title
Emissary has Stored XSS via Navigation Template Link Injection
Source: CVE Program / CVE List V5
Vulnerability Description
Emissary is a P2P based data-driven workflow engine. Prior to 8.39.0, Mustache navigation templates interpolated configuration-controlled link values directly into href attributes without URL scheme validation. An administrator who could modify the navItems configuration could inject javascript: URIs, enabling stored cross-site scripting (XSS) against other authenticated users viewing the Emissary web interface. This vulnerability is fixed in 8.39.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/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
Vulnerability Title
Emissary 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Emissary是National Security Agency开源的一个分布式 P2P 数据驱动工作流框架。 Emissary 8.39.0之前版本存在跨站脚本漏洞，该漏洞源于Mustache导航模板将配置控制的链接值直接插入href属性而未进行URL方案验证，可能导致能够修改navItems配置的管理员注入javascript: URI，从而对其他经过身份验证的用户实施存储型跨站脚本攻击。
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
NationalSecurityAgency emissary < 8.39.0 -

II. Public POCs for CVE-2026-35571

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III. Intelligence Information for CVE-2026-35571

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Vendor Advisories for CVE-2026-35571 (1)

Same Patch Batch · NationalSecurityAgency · 2026-04-07 · 4 CVEs total

CVE-2026-35580 9.1 CRITICAL Emissary has GitHub Actions Shell Injection via Workflow Inputs
CVE-2026-35581 7.2 HIGH Emissary has a Command Injection via PLACE_NAME Configuration in Executrix
CVE-2026-35583 5.3 MEDIUM Emissary has a Path Traversal via Blacklist Bypass in Configuration API

IV. Related Vulnerabilities

Same product: emissary
Same vendor: NationalSecurityAgency
Same weakness: CWE-79

V. Comments for CVE-2026-35571

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