Beginning in July, Microsoft plans to block the .library-ms and .search-ms file types in Outlook due to security threats related to phishing and vulnerabilities. The .library-ms files could leverage a Windows vulnerability to steal NTLM hashes, while .search-ms has been exploited since June 2022 for remote code execution. Microsoft notes that these file types are rarely seen in use, thus limiting the impact on organizations. Users can adjust security settings through administrators if necessary, and Microsoft continues to enhance Outlook's security features.
Starting in July, Microsoft will block .library-ms and .search-ms file types in Outlook to mitigate phishing risks and vulnerabilities associated with these file types.
Microsoft emphasizes that the blocked file types are rarely used within organizations, suggesting limited impact, and provides guidance for users to adjust settings if necessary.
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