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CVE-2026-19490

Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability

Published Aug 19, 2026Sources checked Oct 28, 2026
9.8CRITICALCVSS out of 10
What this means

Actively exploited

CISA lists CVE-2026-19490 in its Known Exploited Vulnerabilities catalog, which means exploitation has been observed. The entry applies to Citrix NetScaler.

  • 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.
What to do next

Remediation and response

Citrix Security Bulletins guidance

Vendor revision: Aug 19, 2026
Vendor remediation details

Cloud Software Group strongly urges affected customers of NetScaler ADC and NetScaler Gateway to install the relevant updated versions as soon as possible.

Vendor-listed releases

  • NetScaler ADC and NetScaler Gateway 14.1-73.32 and later releases
  • NetScaler ADC and NetScaler Gateway 13.1-63.21 and later releases of 13.1
  • NetScaler ADC 14.1-FIPS 14.1-73.32 FIPS and later releases of 14.1-FIPS
  • NetScaler ADC 13.1-FIPS and 13.1-NDcPP 13.1-37.277 and later releases of 13.1-FIPS and 13.1-NDcPP
CISA KEVListedObserved exploitation
EPSS32.7%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors1Source-linked actor relationships
Overview

What is CVE-2026-19490?

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.

Source: NVD

CISA says: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 catalog due date Sep 12, 2026