Citrix warns admins to patch new NetScaler RCE flaw immediately
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Citrix has issued an urgent warning for administrators to patch a critical remote code execution (RCE) vulnerability, tracked as CVE-2026-107406, affecting NetScaler ADC and NetScaler Gateway appliances configured as SAML Identity Providers or Service Providers. The flaw arises from a memory overflow condition that could allow attackers to execute arbitrary code or cause denial-of-service conditions. While there are no known active exploits in the wild at the time of disclosure, Citrix has previously seen rapid exploitation of similar NetScaler vulnerabilities, and over 21,000 NetScaler instances are exposed to the internet, increasing the risk of widespread compromise if left unpatched.
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