CVE-2026-19490 NetScaler auth bypass exploited in the wild since Sept 3

An authentication bypass vulnerability in NetScaler (CVE-2026-19490) is being actively exploited in the wild, with attacks observed since at least September 3. The flaw allows attackers to bypass authentication, potentially leading to full compromise of affected systems. This is a critical security incident affecting enterprise networks, with exploitation ongoing and patch urgency high.