Threat Actors Target Critical Citrix NetScaler Authentication Bypass

Summary

Citrix NetScaler ADC and Gateway appliances face active exploitation of a critical authentication bypass (CVE-2026-19490) that allows unauthenticated attackers to access internal applications and VPN services.

Take Action:

Your NetScaler appliances are now under attack, so act fast. Patch ASAP and check your logs for any unusual logins from the past few weeks. Even if you patch now, an attacker might have already created a back door while the system was open. And make sure to isolate the management interface from the internet.

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This article was originally published on BeyondMachines