CVE-2026-19490: critical vulnerability in NetScaler ADC
NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-19490
Published · Updated
Prioritize patching. It under exploitation confirmed by CISA and has a public proof of concept.
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.
NetScaler ADC and Gateway devices running vulnerable versions (14.1-73.32 or 13.1-63.21) have a critical authentication bypass flaw that allows attackers to bypass security controls and gain unauthorized access to the system.
This authentication bypass vulnerability (CWE-288) affects NetScaler ADC and Gateway across multiple versions. Unauthenticated or low-privileged attackers can circumvent authentication mechanisms to achieve unauthorized access, potentially leading to complete system compromise, data exfiltration, or lateral movement within the network infrastructure.
In the same product, most dangerous first.