CVE-2026-19490Authentication bypass in Citrix NetScaler ADC and Gateway
Citrix NetScaler ADC and NetScaler Gateway contain an authentication-bypass vulnerability involving an alternate path or channel. When the NetScaler appliance is configured as an AAA virtual server or as a Gateway (SSL VPN, ICA Proxy, CVPN, or RDP Proxy), an unauthenticated remote threat actor may be able to bypass authentication.
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Esta vulnerabilidad permite a atacantes remotos saltarse la autenticación en NetScaler ADC y Gateway sin necesidad de credenciales. El fallo está siendo explotado activamente y afecta a dispositivos configurados como servidores AAA o gateways VPN. Es crítico actualizar inmediatamente para evitar el acceso no autorizado a la infraestructura de red.
Relevant roles
Severity
N/A
CISA KEV
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
EPSS
Technical description
Vulnerability in NetScaler ADC and NetScaler Gateway. This issue affects ADC: from 14.1 through 73.32 and from 13.1 through 63.21; Gateway: from 14.1 through 73.32 and from 13.1 through 63.21.