Live › vulnerability › CVE-2026-19490
Go to dashboardAuthentication bypass (CWE-288, CVSS v4 9.3) in customer-managed NetScaler ADC and Gateway. An unauthenticated attacker can skip login when the appliance is a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or an AAA vserver. Under 14.1-43.56+ and 13.1-61.28+ (including 14.1 FIPS 14.1-66.68+), it applies only if a SAML action is also configured. Exploited in the wild and in CISA KEV. Fixed 2026-08-19 in the same release as CVE-2026-19489, a SIP ALG buffer overflow.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
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.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Citrix NetScaler | vendor | – | – |
| NetScaler ADC | vendor | 14.1 < 14.1-73.32; 13.1 < 13.1-63.21; 14.1-FIPS < 14.1-73.32 FIPS; 13.1-FIPS/NDcPP < 13.1-37.277 | 14.1-73.32, 13.1-63.21, 14.1-73.32 FIPS, 13.1-37.277 |
| NetScaler Gateway | vendor | 14.1 < 14.1-73.32; 13.1 < 13.1-63.21 | 14.1-73.32, 13.1-63.21 |
| citrix netscaler application delivery controller |
| vendor |
| >= 13.1, < 13.1-37.277 |
| 13.1-37.277 |
| citrix netscaler application delivery controller | vendor | >= 13.1, < 13.1-63.21 | 13.1-63.21 |
| citrix netscaler application delivery controller | vendor | >= 14.1, < 14.1-73.32 | 14.1-73.32 |
| citrix netscaler application delivery controller | vendor | >= 14.1-66.68, <= 14.1-73.32 | – |
| citrix netscaler gateway | vendor | >= 13.1, < 13.1-63.21 | 13.1-63.21 |
| citrix netscaler gateway | vendor | >= 14.1, < 14.1-73.32 | 14.1-73.32 |
add authentication samlAction, add authentication vserver and add vpn vservershow versionEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
CISA required action: 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.
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