This is Fine: What NetScaler Zero-Days Tell Us About the New Normal

In September 2026, multiple zero-day vulnerabilities affecting Citrix NetScaler ADC and Gateway were actively exploited by unidentified threat actors. These vulnerabilities allowed unauthenticated remote code execution, prompting Citrix to release emergency patches for CVE-2026-88771 through CVE-2026-88778. The rapid detection and patching reflect improved global telemetry and vendor coordination. Organizations using NetScaler devices should remain vigilant for potential additional advisories and maintain readiness to apply emergency patches promptly.

• securityweek.com/this-is-fine-what-netscaler-zero-days-tell-us-about-the-new-normal/ (opens in a new tab)

• NetScaler intrusions chaining CVE-2026-88771 and CVE-2026-88779ExploitedMalware2026-10-20
• NetScaler ADC en NetScaler Gateway · Kwetsbaarheden VerholpenExploitedVulnerability2026-09-27
• CVE-2026-88778: Citrix NetScaler ADC · Predictable Exact Value From Previous ValuesHighVulnerability2026-09-27
• CVE-2026-88771: Citrix NetScaler ADC · Improper Input ValidationCriticalVulnerability2026-09-27