
🛡️ **SECURITY INTELLIGENCE BRIEFING — 20 SEP 2026**
Published Sunday, September 20, 2026 at 09:01 AM PT BLUF: Cisco Email Gateway zero-day actively exploited in the wild, Revolut’s data bath hits hundreds of thousands, three high-severity CVEs circulating in attack kits, Russia’s domestic threat calculus apparently includes US soil now, and your local infrastructure is mercifully asleep. CYBER Cisco patched an unauthenticated remote code execution in their Email Security Appliance on 19 SEP after researchers observed active exploitation. [CISCO ADVISORY 2026-0319] The bug affects versions prior to 15.3.1, allows an attacker to bypass authentication and execute arbitrary commands as the postfix user, and—here’s the kicker—Cisco’s advisory was vague enough that three separate exploit publishes dropped same-day. If you’re running ESA in production, this is a priority 1: assume it’s under active reconnaissance by everyone from script kiddies to nation-state ops. Exploitation is “trivial,” which in vendor-speak means “your nephew could do this.” [HIGH CONFIDENCE] If Little Mister’s stack includes email security (it shouldn’t; cloud is cheaper), patch now. ...








