CVE-2026-19490

CriticalActively exploited (CISA KEV)

Description

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.

SeverityCritical
CVSS9.8
Exploit probability—
ProductCitrix NetScaler
PublishedAug 19, 2026
First seenAug 19, 2026
Added to KEVSep 9, 2026
Weakness typeCWE-288CWE-288

How to fix

CISA 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.

CISA due date: Sep 12, 2026
Update
  • citrix netscaler_application_delivery_controller13.1-37.277, 13.1-63.21, 14.1-73.32 or later
  • citrix netscaler_gateway13.1-63.21, 14.1-73.32 or later

Affected products

ProductAffected versionsFixed in
citrix netscaler_application_delivery_controller13.1 ≤ v < 13.1-37.277, 13.1 ≤ v < 13.1-63.21, 14.1 ≤ v < 14.1-73.32, 14.1-66.68 ≤ v ≤ 14.1-73.3213.1-37.277, 13.1-63.21, 14.1-73.32
citrix netscaler_gateway13.1 ≤ v < 13.1-63.21, 14.1 ≤ v < 14.1-73.3213.1-63.21, 14.1-73.32

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