Microsoft Exchange Flaw Lets Authenticated Attackers Read Other Users' Mailboxes

The document aggregates cybersecurity news from October 2026, including actively exploited zero-days, critical vulnerabilities, ransomware, espionage campaigns, credential phishing, botnets, backdoors, and security product updates. Notable issues include unauthenticated arbitrary file writes in FortiMail, NetScaler zero-day exploitation, Rejetto HFS session forgery leading to remote code execution, Dell CSM flaws enabling unauthenticated administrative access and Kubernetes node root, Microsoft Exchange privilege escalation, and attacks against SharePoint and Realtek Jungle SDK. It also covers