Cyber Security News for September 9 2026 - Daily DefSec Brief

Daily DefSec Brief · Sep 9, 2026 · 5m · transcript

1. Record 974-CVE Patch Tuesday, two zero-days live — CVE-2026-81963, CVE-2026-85880 (CVSS 7.8) — Do: Install September Windows updates now — SecurityWeek — https://www.securityweek.com/microsoft-patches-record-974-vulnerabilities-including-two-exploited-zero-days/ 2. Chrome 153 patches its seventh zero-day of 2026 — CVE-2026-87491 — Do: Push Chrome 153.0.8010.36, force restart — SecurityWeek — https://www.securityweek.com/chrome-153-patches-seventh-zero-day-of-2026/ 3. F5 BIG-IP rootkit hides its web shell in memory — CVE-2025-53521 (CVSS 9.8) — Do: Patch BIG-IP APM, then hunt memory — The…