New NetScaler Zero-Day Exploited in Targeted Attacks Can Knock SAML Deployments Offline

Citrix has issued security updates to address a high-severity flaw in NetScaler ADC and Citrix NetScaler Gateway that is being exploited in targeted zero-day attacks. The vulnerability is a memory overflow issue that can be found in Citrix NetScaler ADC and Citrix NetScaler Gateway. It has a CVSS score of 8.7 out of 10.0, indicating a significant level of severity. This flaw is identified as CVE-2026-88779 and can cause disruptions. The vulnerability can lead to SAML deployments being knocked offline.