Severity of Bulletin: Critical

Description of Problem

Multiple vulnerabilities have been discovered in NetScaler ADC (formerly Citrix ADC) and NetScaler Gateway (formerly Citrix Gateway). Refer below for further details.

Affected Versions: 

The following supported versions of NetScaler ADC and NetScaler Gateway are affected by the vulnerabilities: 

• NetScaler ADC and NetScaler Gateway 14.1 BEFORE 14.1-73.32

• NetScaler ADC and NetScaler Gateway 13.1 BEFORE 13.1-63.21

• NetScaler ADC FIPS BEFORE 14.1-73.32 FIPS

• NetScaler ADC FIPS and NDcPP BEFORE 13.1-37.277

Additional Note: Secure Private Access Hybrid deployments using NetScaler instances are also affected by the vulnerabilities. Customers need to upgrade these NetScaler instances to the recommended NetScaler builds to address the vulnerabilities. 

This bulletin only applies to customer-managed NetScaler ADC and NetScaler Gateway. Cloud Software Group upgrades the Citrix-managed cloud services and Citrix-managed Adaptive Authentication with the necessary software updates.

NetScaler ADC and NetScaler Gateway are affected by the vulnerabilities mentioned below

What Customers Should Do

Cloud Software Group strongly urges affected customers of NetScaler ADC and NetScaler Gateway to install the relevant updated versions as soon as possible. 

• NetScaler ADC and NetScaler Gateway 14.1-73.32 and later releases

• NetScaler ADC and NetScaler Gateway 13.1-63.21 and later releases of 13.1

• NetScaler ADC 14.1-FIPS 14.1-73.32 FIPS and later releases of 14.1-FIPS

• NetScaler ADC 13.1-FIPS and 13.1-NDcPP 13.1-37.277 and later releases of 13.1-FIPS and 13.1-NDcPP

Steps to determine if an appliance meets the CVE preconditions

For CVE-2026-19489:

Customers can determine if the appliance meets the precondition by inspecting their NetScaler configuration for the specified string:

• "​add lsn group.*sipalg.*" 

For CVE-2026-19490: 

Customers can determine if the appliance meets the precondition by inspecting their NetScaler configuration for the specified string:

SAML action configuration

• "add authentication samlAction.*"

 Auth or VPN vserver

•  "add authentication vserver .*"

               Or 

•  "add vpn vserver .*"

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Multiple vulnerabilities have been discovered in NetScaler ADC (formerly Citrix ADC) and NetScaler Gateway (formerly Citrix Gateway).

Refer below for further details.

Acknowledgement

Cloud Software Group thanks Samarth Vashisht from the pen-test team at JPMorgan Chase for working with us to protect our customers.

Workarounds/ Mitigating Factors

None

What Citrix is Doing

Citrix is notifying customers and channel partners about this potential security issue through the publication of this security bulletin on the Citrix Knowledge Center at https://support.citrix.com/support-home/topic-article-list?trendingCategory=20&trendingTopicName=Security%20Bulletin  

Obtaining Support on This Issue

If you require technical assistance with this issue, please contact Citrix Technical Support. Contact details for Citrix Technical Support are available at https://support.citrix.com/knowledge-center#/   

Subscribe to Receive Alerts

Citrix strongly recommends that all customers subscribe to receive alerts when a Citrix security bulletin is created or modified at https://support.citrix.com/wolken-support/view/aboutsupport/my-support-alerts 

Reporting Security Vulnerabilities to Citrix 

Citrix welcomes input regarding the security of its products and considers any and all potential vulnerabilities seriously. For details on our vulnerability response process and guidance on how to report security-related issues to Citrix, please see the following webpage: https://www.cloud.com/trust-center/support 

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