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The KB5070311 update for Windows 11 addresses critical issues such as File Explorer freezes and search problems, enhancing overall system stability and performance. This update includes 49 changes aimed at improving user experience and resolving known bugs.

Cato Networks has identified a new vulnerability known as HashJack, which exploits the '#' symbol in URLs to execute malicious commands in AI browsers. While Microsoft and Perplexity have addressed this flaw, Google's Gemini remains vulnerable, highlighting a significant risk for users of that platform.

New research highlights a significant security vulnerability in Microsoft Teams B2B Guest Access, allowing attackers to circumvent Defender for Office 365 protections with just a single invitation. This flaw poses a serious risk of malware attacks on users, emphasizing the need for immediate attention to security protocols within the platform.

Microsoft has alerted users that FIDO2 security keys may require a PIN for sign-in following recent Windows updates since September 2025. This change could affect user experience and security practices, particularly for those relying on these security keys for authentication.

Microsoft is set to enhance the security of its Entra ID authentication system to protect against external script injection attacks starting in mid-to-late October 2026. This improvement aims to mitigate potential vulnerabilities that could be exploited by attackers to compromise user sign-ins.

The article discusses a vulnerability in Opto 22's groov View that allows for the exposure of sensitive information through metadata, potentially leading to credential and key exposure as well as privilege escalation. This vulnerability, assigned CVE-2025-13084, has a CVSS v4 score of 6.1 and affects multiple versions of groov View, necessitating immediate remediation to mitigate risks.

Microsoft has raised concerns about the security risks associated with its new Agentic AI feature, highlighting the potential for AI agents to engage in malicious activities like data exfiltration and malware installation if not properly secured. This underscores the critical need for robust security controls to mitigate these risks.

The report highlights the evolving landscape of IT threats in Q3 2025, focusing on malware targeting Windows and macOS personal computers, as well as IoT devices. This indicates a growing severity of cyber threats that could have significant implications for users and organizations relying on these systems.