CVE-2026-19490
Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability
Summary
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.
Affected software
Vendor: Citrix · Product: NetScaler
Weakness types (CWE):
What to do
This vulnerability appears in CISA's Known Exploited Vulnerabilities catalog, meaning it is being exploited in the wild. Prioritize patching affected systems and verify exposure across your estate.
Related vulnerabilities in Citrix
| CVE | Name | EPSS | Exploited |
|---|---|---|---|
| CVE-2023-4966 | Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability | 100.0% | Yes |
| CVE-2019-19781 | Citrix ADC, Gateway, and SD-WAN WANOP Appliance Code Execution Vulnerability | 100.0% | Yes |
| CVE-2025-5777 | Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability | 100.0% | Yes |
| CVE-2023-3519 | Citrix NetScaler ADC and NetScaler Gateway Code Injection Vulnerability | 99.7% | Yes |
| CVE-2023-24489 | Citrix Content Collaboration ShareFile Improper Access Control Vulnerability | 97.3% | Yes |
| CVE-2019-12989 | Citrix SD-WAN and NetScaler SQL Injection Vulnerability | 94.1% | Yes |
| CVE-2020-8193 | Citrix ADC, Gateway, and SD-WAN WANOP Appliance Authorization Bypass Vulnerabili | 88.4% | Yes |
| CVE-2026-3055 | Citrix NetScaler Out-of-Bounds Read Vulnerability | 87.2% | Yes |
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