Local privilege escalation via use-after-free
Published Oct 14, 2025 · Updated Feb 22, 2026
Use-after-free in Microsoft Brokering File System on affected Windows builds allows local users to elevate privileges. The component accesses an object after its lifetime has ended, but Microsoft has not disclosed the responsible routine or attacker-controlled operation. Local code execution is required; successful exploitation grants elevated access, while attack complexity is high and no user interaction is required.
Summary
What happened
Use-after-free in Microsoft Brokering File System on affected Windows builds allows local users to elevate privileges. The component accesses an object after its lifetime has ended, but Microsoft has not disclosed the responsible routine or attacker-controlled operation. Local code execution is required; successful exploitation grants elevated access, while attack complexity is high and no user interaction is required.
The record
- CVE
- CVE-2025-59189
- Published
- Oct 14, 2025
- Updated
- Feb 22, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 14, 2025CVE publishedPublication date reported by the CVE source.
- Feb 22, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.26100.0 <10.0.26100.6899
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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