apt-activity

Messaging and Collaboration Infrastructure Is Still an APT-Friendly Entry Point

John Z Black Mar 20, 2026

Threat Intelligence #apt-activity #zimbra #roundcube #opensips #collaboration-security #comms-infrastructure

Zimbra exploitation, Roundcube sanitizer bypasses, and OpenSIPS auth-bypass risk all point to one truth: communication infrastructure remains a high-value route to durable access.