All vulnerabilities
CVE-2026-19490

Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability

Citrix NetScalerNetwork & edge
CVSS
9.3Critical
ExploitationExploited in the wildAdded to KEV 9 Sep 2026CISA KEV
Exploit odds (EPSS)23.2%Chance of exploitation activity in the next 30 days, higher than 97% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version yet
Federal deadline12 Sep 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply 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 KEV
Patching is not enoughCISA requires federal agencies to look for signs of compromise on affected systems, not only patch (forensic triage under BOD 26-04). Treat exposed systems as possibly compromised. CISA guidance

What fixes it

No source in this snapshot names a fixed version.

Timeline

  1. 19 Aug 2026, 12:54 UTCPublishedCVE List
  2. 9 Sep 2026Added to CISA KEVCISA KEV
  3. 23 Oct 2026, 23:41 UTCExploit code publicGitHub proof-of-concept repositories

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

Description

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.

Text from CVE List

Affected versions 4

  • ADCaffected: 14.1 through 73.32CVE List
  • ADCaffected: 13.1 through 63.21CVE List
  • Gatewayaffected: 14.1 through 73.32CVE List
  • Gatewayaffected: 13.1 through 63.21CVE List

References 4