Cyber Security News for September 15 2026 - Daily DefSec Brief

Daily DefSec Brief · Sep 15, 2026 · 4m · transcript

1. Cisco email gateway zero-day exploited for root — CVE-2026-76461, CVSS 9.8 — Do: Upgrade AsyncOS 16.5.0-780, grep mail_logs — https://www.bleepingcomputer.com/news/security/new-cisco-secure-email-zero-day-exploited-to-execute-commands-as-root/ 2. Vite dev servers scanned for cloud credentials — CVE-2026-39364, CVSS 7.5 — Do: Upgrade Vite to 7.3.2 or 8.0.5 — https://www.bleepingcomputer.com/news/security/hackers-target-exposed-vite-dev-servers-to-steal-aws-azure-secrets/ 3. AI agents ran a credential campaign in six hours — Do: Shorten cloud key lifetimes and alert on scanning —…