Citrix Urges Immediate Patching of Critical NetScaler Vulnerability

SecurityWeek RSS digest covering critical vulnerabilities and active exploitation across Citrix NetScaler, Cisco, Atlassian Data Center, SonicWall, Splunk, and TP-Link products; a $10 million US reward related to alleged Hafnium activity; Pwn2Own 2026 exploit disclosures; and broader security-awareness and AI-security research. The most urgent items are the critical Citrix NetScaler flaw enabling possible remote code execution or denial of service and active targeting of Atlassian CVE-2026-21589 shortly after proof-of-concept publication.