CVE-2026-19490
Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability
Citrix NetScalerNetwork & edge
CVSS
9.3CriticalExploit 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
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
- 19 Aug 2026, 12:54 UTCPublishedCVE List
- 9 Sep 2026Added to CISA KEVCISA KEV
- 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
- support.citrix.com/external/article/CTX696939/netscaler-adc-and-netscaler-gateway-secu.htmlReferencevia CISA KEV
- nvd.nist.gov/vuln/detail/CVE-2026-19490Referencevia CISA KEV
- support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696939Referencevia CVE List
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-19490Referencevia CVE List