Citrix NetScaler ADC and Citrix NetScaler Gateway are affected by the vulnerability identified below

What Customers Should Do

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

• Citrix NetScaler ADC and Citrix NetScaler Gateway 14.1-73.46  and later releases
• Citrix NetScaler ADC and Citrix NetScaler Gateway 13.1-64.29  and later releases of 13.1
• Citrix NetScaler ADC 14.1-FIPS 14.1-73.46 FIPS and later releases of 14.1-FIPS
• Citrix NetScaler ADC 13.1-FIPS and 13.1-NDcPP 13.1.37.283 and later releases of 13.1-FIPS and 13.1-NDcPP

Steps to determine if an appliance meets the CVE preconditions

Instructions: 

Customers can determine whether their NetScaler deployment is configured as a SAML identity provider (IdP) or service provider (SP) by checking its configuration for entries matching either of the following:

• Appliance is configured as a SAML SP
  
  add authentication samlAction
  
  
• Appliance is configured as a SAML IdP
  
  add authentication samlIdPProfile

(Note: For version-specific requirements, see the “Affected Versions” section above.)

Acknowledgement

Cloud Software Group acknowledges Michael Tucker, Chew Keong Tan and Alex Bernier of the JPMorgan Chase XOR Team, and Maxim Suhanov, for working with us to protect our customers.

Severity - Critical

Description of Problem

A vulnerability has been discovered in Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway). Refer below for further details.

Affected Versions:

The following supported versions of Citrix NetScaler ADC and Citrix NetScaler Gateway are affected by the vulnerability if they meet the following conditions: 
NetScaler ADC or NetScaler Gateway must be configured as a SAML SP or SAML IdP, subject to the following version-specific requirements:

For the following versions: Applicable only when configured as a SAML IdP:

• NetScaler ADC and NetScaler Gateway between 14.1-73.37 and 14.1-73.41, inclusive
• NetScaler ADC 14.1-FIPS between 14.1-73.37 FIPS and 14.1-73.41 FIPS, inclusive
• NetScaler ADC and NetScaler Gateway between 13.1-64.23 and 13.1-64.28, inclusive
• NetScaler ADC 13.1-FIPS between 13.1-NDcPP 13.1-37.279 and 13.1- 37.282, inclusive

For the following versions: Applicable only when configured as a SAML SP or SAML IdP:

• NetScaler ADC and NetScaler Gateway before 14.1-73.37
• NetScaler ADC 14.1-FIPS before 14.1-73.37 FIPS
• NetScaler ADC and NetScaler Gateway before 13.1-64.23
• NetScaler ADC 13.1-FIPS before 13.1-NDcPP 13.1-37.279

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

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

Blog

Cloud Software Group team has published a related blog at: https://community.citrix.com/techzone-blogs/110_security-updates/protecting-customers-immediate-guidance-for-cve-2026-107406-in-netscaler-adc-and-netscaler-gateway-r1631/ which contains further context.

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/support-home/home 

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 

Changelog