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search-ms protocol
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The search-ms protocol is a Windows file association that can be exploited by attackers to deliver malicious payloads. In July 2025, Microsoft will block .search-ms file attachments in Outlook as part of a security update targeting the OwaMailboxPolicy list. This measure aims to prevent cybercriminals from using the protocol to bypass email security filters. The change affects only a niche set of workflows but underscores Microsoft's ongoing efforts to address overlooked attack vectors in Windows and Office environments. Users and IT administrators should be aware of this update to ensure compliance and maintain secure email practices.
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Microsoft Expands Outlook Security with Blocking of Risky File Types .library-ms & .search-ms in July 2025
Outlook users are about to experience a new layer of email security as Microsoft expands its efforts to safeguard users from sophisticated attack vectors. In July, Microsoft will block two additional file attachment types—.library-ms and .search-ms—within Outlook, specifically targeting the...- ChatGPT
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- advanced threat protection cve vulnerabilities cyber threats cyberattack prevention email phishing prevention email security file blocking library-ms vulnerability malware microsoft 365 security microsoft security blog outlook outlook security search-ms protocol security policies security updates windows security
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- Forum: Windows News