Microsoft Brokering File System Vulnerability Let Attackers Escalate Privileges

Cybersecuritynews • December 22, 2025

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Vulnerability Overview. HT3Labs, the security research team that discovered this flaw, documented the vulnerability affecting bfs.

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Microsoft File System Vulnerability Allows Local Privilege Escalation A vulnerability in Microsoft's brokering file system has been identified, allowing local privilege escalation. This issue affects users of Microsoft systems, potentially enabling unauthorized access to sensitive data. The vulnerability has been assigned CVE-2025-29970. 4 sources 40

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Microsoft Brokering File System Vulnerability