Exploited vulnerability CISA KEV
CVE-2026-19490: Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability
CVE-2026-19490 is a vulnerability in Citrix NetScaler that CISA added to its Known Exploited Vulnerabilities catalog on September 9, 2026, meaning there is evidence it is being exploited. US federal civilian agencies must complete the required action by September 12, 2026.
CVE-2026-19490 is a vulnerability in Citrix NetScaler that CISA added to its Known Exploited Vulnerabilities catalog on September 9, 2026, meaning there is evidence it is being exploited. US federal civilian agencies must complete the required action by September 12, 2026.
- CVE ID
- CVE-2026-19490
- Vendor / project
- Citrix
- Product
- NetScaler
- Added to KEV
- Due date
- Days to remediate
- 3
- Known ransomware use
- Unknown
- Weakness
- CWE-288
CISA 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.
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.
Notes and references #
https://support.citrix.com/external/article/CTX696939/netscaler-adc-and-netscaler-gateway-secu.html ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-19490
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