Main Vulnerability Database Vulnerabilities #VU144334

Authentication bypass using an alternate path or channel in Citrix Netscaler ADC and Citrix NetScaler Gateway - CVE-2026-19490

Published: August 19, 2026

Vulnerability identifier: #VU144334

CSH Severity: High

CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-19490

CWE-ID: CWE-288

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to bypass authentication.

The vulnerability exists due to authentication bypass using an alternate path in the Gateway or AAA virtual server authentication functionality when handling authentication requests. A remote attacker can use an alternate path to bypass authentication.

The issue is exposed only on appliances configured as a Gateway or an AAA virtual server, and on certain versions only when configured with a SAML action.

Affected software

Citrix Netscaler ADC
Citrix NetScaler Gateway

How to mitigate CVE-2026-19490

Install security update from vendor's website.

Citrix Netscaler ADC - addressed in versions 13.1-63.21, 14.1-73.32
Citrix NetScaler Gateway - addressed in versions 13.1-63.21, 14.1-73.32

External References

Related Security Bulletins