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

April 7, 2026

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.

References

  • github.com/NationalSecurityAgency/emissary
  • github.com/NationalSecurityAgency/emissary/commit/e2078417464b9004620dde28dcbca2f73ea06c13
  • github.com/NationalSecurityAgency/emissary/pull/1293
  • github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-cpm7-cfpx-3hvp
  • github.com/advisories/GHSA-cpm7-cfpx-3hvp
  • nvd.nist.gov/vuln/detail/CVE-2026-35571

Code Behaviors & Features

Detect and mitigate CVE-2026-35571 with GitLab Dependency Scanning

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Affected versions

All versions before 8.39.0

Fixed versions

  • 8.39.0

Solution

Upgrade to version 8.39.0 or above.

Impact 4.8 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Learn more about CVSS

Weakness

  • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Source file

maven/gov.nsa.emissary/emissary/CVE-2026-35571.yml

Spotted a mistake? Edit the file on GitLab.

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