Public preview. Built from real public data on November 9, 2026, 5:41 AM UTC.
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VulnerabilityKnown exploitedExploit likelihood 33%

Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability

CVE-2026-19490 · CISA KEV · September 9, 2026

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.

From CISA, quoted as published. Check the source before acting.

What to do

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.

CISA required action, quoted.

Affected products

VendorProductAffected versionsFixed
CitrixNetScaler——

Why it's on these mode pages

  • Maritime: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)
  • Pipeline: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)
  • Freight rail: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)
  • Passenger rail and transit: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)
  • Highway and motor carrier: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)
  • Postal and parcel: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)

Change history

  1. November 9, 2026: First collected by Watch

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