On the first day of Pwn2Own Ireland 2025, security researchers exploited 34 unique zero-days and collected $522,500 in cash awards. [...]

Microsoft has confirmed that Windows updates released since August 29, 2025, are breaking authentication on systems sharing Security Identifiers. [...]

Microsoft has fixed a major bug preventing Microsoft 365 users from launching the classic Outlook email client on Windows systems. [...]

Microsoft has released an emergency update to fix the Windows Recovery Environment (WinRE), which became unusable on systems with USB mice and keyboards after installing the October 2025 security updates. [...]

Microsoft has confirmed that this month's security updates disable USB mice and keyboards in the Windows Recovery Environment (WinRE), making it unusable. [...]

CISA says threat actors are now actively exploiting a high-severity Windows SMB privilege escalation vulnerability that can let them gain SYSTEM privileges on unpatched systems. [...]

Microsoft is rolling out a fix for Active Directory issues affecting some Windows Server 2025 systems after installing security updates released since September. [...]

Microsoft says the October 2025 Windows security updates are causing smart card authentication and certificate issues due to a change designed to strengthen the Windows Cryptographic Services. [...]

Microsoft has removed two more compatibility holds preventing customers from installing Windows 11 24H2 via Windows Update. [...]

Earlier this week, Microsoft patched a vulnerability that was flagged with the "highest ever" severity rating received by an ASP.NET Core security flaw. [...]

Microsoft has fixed a known issue breaking HTTP/2 localhost (127.0.0.1) connections and IIS websites after installing recent Windows security updates. [...]

Internet security nonprofit Shadowserver Foundation has found more than 266,000 F5 BIG-IP instances exposed online after the security breach disclosed by cybersecurity company F5 this week. [...]

Hackers stole the personal information of over 17.6 million people after breaching the systems of financial services company Prosper. [...]

Microsoft has disrupted a wave of Rhysida ransomware attacks in early October by revoking over 200 certificates used to sign malicious Teams installers. [...]

​​​​​Microsoft reminded customers this week that Office 2016 and Office 2019 have reached the end of extended support on October 14, 2025. [...]

CISA has warned that attackers are actively exploiting a maximum-severity vulnerability in Adobe Experience Manager to execute code on unpatched systems. [...]

Microsoft says Windows 11 users can now start a conversation with the AI-powered Copilot digital assistant by saying the "Hey Copilot" wake word. [...]

19-year-old college student Matthew D. Lane, from Worcester, Massachusetts, was sentenced to 4 years in prison for orchestrating a cyberattack on PowerSchool in December 2024 that resulted in a massive data breach. [...]

Cybersecurity company F5 has released security updates to address BIG-IP vulnerabilities stolen in a breach detected on August 9, 2025. [...]