Security Signal Weekly: August 15-21, 2026

OverviewThis week, the most important stories were not subtle. CISA moved two Windows bugs and an MLflow flaw up the priority list because attackers are already using them. Zimbra admins also got an active-exploitation warning, while Citrix put another pair of internet-facing NetScaler issues into emergency-patch territory.The bigger pattern is that attackers keep looking for leverage: a VPN gateway, an email server, a cloud credential, a PLC, a developer build, or an identity flow that quietly skips the controls everyone assumed were there. My takeaway is simple. Start with the exposed systems and confirmed exploitation, then check the trust paths behind them instead of stopping when the patch job says complete.Reality check: A patch dashboard can tell you an update was assigned. It cannot tell you the vulnerable service is gone, the appliance actually rebooted into the fixed build, or the attacker did not arrive first.Top 10 Security Signals1. Windows IKE remote-code-execution flaw…