Cross-site scripting in emissary - CVE-2026-35571
Published: April 7, 2026
Vulnerability identifier: #VU125043
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-35571
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: National Security Agency
Affected software:
emissary
emissary
Detailed vulnerability description
The vulnerability allows a remote user to perform cross-site scripting.
The vulnerability exists due to improper input validation in the nav.mustache navigation template when rendering configuration-controlled link values into href attributes. A remote privileged user can inject a javascript: URI into a navigation item link to perform cross-site scripting.
User interaction is required, as a victim must click the malicious navigation link in the web interface.
How to mitigate CVE-2026-35571
Install security update from vendor's website.