CVE-2026-35571CWE-79

Emissary has Stored XSS via Navigation Template Link Injection

Medium · published April 7, 2026

CVSS v3.1
4.8
EPSS
0%
Percentile
17.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00263 · 17.1th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-04-07T15:26Z
EPSS history
Timeline
  • 07 APR 15:26Z
    Emissary has Stored XSS via Navigation Template Link Injection
    cvelistv5