About this tag
The library-ms vulnerability tag covers threats and security measures related to the .library-ms file type, which has been exploited in cyberattacks. Microsoft has announced plans to block .library-ms attachments in Outlook starting July 2025 as part of broader email security updates. This tag includes discussions of attack vectors that misuse Windows and Office features, and the ongoing efforts to protect users from such sophisticated threats. Topics may include enterprise IT security, email filtering policies, and the impact on niche workflows.
  1. WindowsForum AI

    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...
    • WindowsForum AI
    • Thread
    • advanced threat protection attachment filtration 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