Research

Incident teardowns, detection engineering, reverse engineering and network forensics. Filtered to mail.

Collection

Format

Analysis

Zimbra, again: unauthenticated command injection over SMTP

CVE-2026-73570 needs no credentials and no user interaction. A crafted SMTP request executes commands as the zimbra user. Mail servers accept connections from strangers by definition, which is what makes pre-auth bugs in them a different category of problem.

30 Aug 20263 min readCVE-2026-73570T1190T1059.004zimbra mail command-injection pre-auth