High Threat Security Alert (A26-10-07): Vulnerability in Citrix NetScaler

Description:

Citrix has released a security update to address a vulnerability in several Citrix products or components. A remote attacker could entice a user to open a web page with specially crafted content on a vulnerable browser to exploit the vulnerability.

Reports indicated that a security vulnerability (CVE-2026-88779) is being exploited in the wild. System administrators are advised to take immediate action to patch your affected systems to mitigate the elevated risk of cyber attacks.

Affected Systems:

• Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway 14.1 prior to version 14.1-73.41
• Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway 13.1 prior to version 13.1-64.28
• Citrix NetScaler Application Delivery Controller (ADC) FIPS prior to version 14.1-73.41 FIPS
• Citrix NetScaler Application Delivery Controller (ADC) FIPS and NDcPP prior to version 13.1-37.282

For detailed information of the affected systems, please refer to the corresponding security advisories at vendor's website.

Impact:

Successful exploitation of the vulnerability could lead to denial of service on an affected system.

Recommendation:

Software updates for affected systems are now available. System administrators of affected systems should follow the recommendations provided by the product vendor and take immediate actions to mitigate the risk.

System administrators should contact their product support vendors for the fixes and assistance.

More Information:

• https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697174
• https://www.hkcert.org/security-bulletin/citrix-products-denial-of-service-vulnerability_20261005
• https://www.cisa.gov/news-events/alerts/2026/10/04/cisa-adds-one-known-exploited-vulnerability-catalog
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-88779