Cisco Secure Email Gateway zero-day compromises anti-phishing infrastructure

CVE-2026-76461 is being exploited through crafted email to obtain unauthenticated root-level execution on Cisco email gateways, with possible log wiping and external command-and-control activity. Emergency patching, appliance isolation, and forensic review are urgent for financial organizations because gateway takeover could enable stealthy interception, filtering changes, and downstream phishing or BEC operations.