Server-Side Request Forgery (SSRF) in emissary - CVE-2026-54442
Published: November 6, 2026
Vulnerability identifier: #VU159614
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-54442
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to make the Emissary server issue requests to internal services through server-side request forgery.
The vulnerability exists due to incomplete URL validation in Emissary's NavAction component when navigation links contain protocol-relative URLs or malformed HTTP scheme variants. An unauthenticated remote attacker can submit crafted navigation links that bypass validation and direct server requests to an attacker-selected destination.
Affected software
emissary
How to mitigate CVE-2026-54442
Install security update from vendor's website.
emissary - update to 8.51.0