Ethical Hacking News
A critical vulnerability in Citrix's NetScaler ADC and Gateway has been identified, posing a significant threat to network security. The vulnerability, CVE-2026-107406, can allow remote code execution or denial-of-service attacks, depending on the system's configuration. Citrix has released security updates to fix the vulnerability, and customers are urged to take immediate action to patch their systems and prevent potential attacks.
CVE-2026-107406 is a critical vulnerability in Citrix's NetScaler ADC and Gateway, with a CVSS score of 9.5, allowing remote code execution or denial-of-service attacks.Citrix has released security updates to fix the vulnerability and urges customers to review the advisory and upgrade their impacted NetScaler instances.The vulnerability affects versions 14.1-73.46 and later, 13.1-64.29 and later, and certain FIPS releases of NetScaler.Customers must check their configuration to determine if their appliance is set up as a SAML Service Provider or Identity Provider.The vulnerability can be exploited to disrupt services or run malicious code remotely, and its impact depends on the system's configuration.Citrix has also confirmed the active exploitation of two other flaws (CVE-2026-88771 and CVE-2026-88772) on unpatched systems.
A recent vulnerability in Citrix's NetScaler ADC and Gateway has raised significant concerns about the security of network infrastructure. CVE-2026-107406, a critical flaw with a CVSS score of 9.5, can allow remote code execution or denial-of-service attacks, depending on the system's configuration. The vulnerability is caused by a memory overflow and affects certain customer-managed deployments running vulnerable versions.
Citrix has released security updates to fix the vulnerability, and customers are urged to review the advisory and upgrade their impacted NetScaler instances to the recommended versions as soon as possible. However, the company is not aware of any unmitigated exploits of this vulnerability at this time, and it is essential for customers to check their configuration to see whether their appliance is set up as a SAML Service Provider (SP) or Identity Provider (IdP).
The vulnerability affects the following versions of Citrix NetScaler ADC and Gateway: 14.1-73.46 and later releases, 13.1-64.29 and later releases of 13.1, 14.1-FIPS 14.1-73.46 FIPS and later releases of 14.1-FIPS, and 13.1-FIPS and 13.1-NDcPP 13.1.37.283 and later releases of 13.1-FIPS and 13.1-NDcPP. Customers can check their NetScaler configuration to determine if their appliance is set up as a SAML Service Provider (SP) or Identity Provider (IdP).
This vulnerability is significant because it can be exploited by attackers to disrupt services or run malicious code remotely. The impact of the vulnerability depends on the system's configuration, and it is essential for customers to take immediate action to patch their systems and prevent potential attacks.
In addition to this vulnerability, Citrix has recently confirmed the active exploitation of two other flaws, respectively tracked as CVE-2026-88771 and CVE-2026-88772, on unpatched systems. Customers are urged to install the relevant updates as soon as possible to prevent potential attacks.
The vulnerability was reported by Michael Tucker, Chew Keong Tan, and Alex Bernier of the JPMorgan Chase XOR Team, and Maxim Suhanov. Citrix has taken steps to address the vulnerability and has released security updates to fix CVE-2026-107406.
It is essential for organizations to stay informed about the latest security vulnerabilities and to take proactive measures to patch their systems and prevent potential attacks. This vulnerability highlights the importance of regular security updates and the need for customers to stay vigilant in protecting their network infrastructure.
Related Information:
https://www.ethicalhackingnews.com/articles/Critical-Citrix-NetScaler-Vulnerability-A-Threat-to-Network-Security-ehn.shtml
https://securityaffairs.com/200670/security/cve-2026-107406-citrix-fixes-critical-netscaler-adc-and-gateway-vulnerability.html
https://nvd.nist.gov/vuln/detail/CVE-2026-107406
https://www.cvedetails.com/cve/CVE-2026-107406/
https://nvd.nist.gov/vuln/detail/CVE-2026-88771
https://www.cvedetails.com/cve/CVE-2026-88771/
https://nvd.nist.gov/vuln/detail/CVE-2026-88772
https://www.cvedetails.com/cve/CVE-2026-88772/
Published: Fri Oct 9 06:26:23 2026 by llama3.2 3B Q4_K_M
