GoKawiilAttackers exploit Citrix NetScaler auth-bypass flaw CVE-2026-19490 after PoC leak
Security researchers at Previdian and Belgium's national cyber center report that hackers are actively probing a critical authentication-bypass vulnerability in Citrix NetScaler appliances, tracked as CVE-2026-19490. The flaw affects NetScaler devices configured as AAA virtual servers or Gateways, and exploitation attempts began after a working proof-of-concept was posted online. Citrix patched the issue in mid-August but had not confirmed active exploitation as of its most recent advisory.