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

CVE-2026-35571 · Severity: medium · CVSS 4.8 · Published 2026-04-07

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.

Technologies: gov.nsa.emissary:emissary (Maven), Nsa Emissary. Vendors: Maven, Nsa.

Quick answers

Is CVE-2026-35571 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-35571 being exploited in the wild.
How severe is CVE-2026-35571?
Medium severity, with a CVSS score of 4.8, published 7 April 2026.
Which products and versions are affected?
gov.nsa.emissary:emissary (Maven) <= 8.38.0, ECOSYSTEM:introduced=0,fixed=8.39.0.
Is there a fix for CVE-2026-35571?
Yes. gov.nsa.emissary:emissary (Maven): upgrade to 8.39.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-35571?
Check whether you run gov.nsa.emissary:emissary (Maven) or Nsa Emissary at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • gov.nsa.emissary:emissary (Maven): upgrade to 8.39.0 or later
    # set gov.nsa.emissary:emissary to 8.39.0 in your pom.xml or build.gradle

Affected products

  • gov.nsa.emissary:emissary (Maven) <= 8.38.0, ECOSYSTEM:introduced=0,fixed=8.39.0
  • Nsa Emissary

Identifiers

  • CVE-2026-35571
  • GHSA-cpm7-cfpx-3hvp

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.