Local security-feature bypass
Published Oct 14, 2025 · Updated Oct 14, 2025
Cleartext transmission in Microsoft Windows Hello allows local users to bypass a security feature without authentication. Microsoft has not disclosed the sensitive data, transmission path, or Windows Hello operation that exposes it in cleartext. Exploitation requires local access but no user interaction, and it can compromise confidentiality and integrity without interrupting service.
Summary
What happened
Cleartext transmission in Microsoft Windows Hello allows local users to bypass a security feature without authentication. Microsoft has not disclosed the sensitive data, transmission path, or Windows Hello operation that exposes it in cleartext. Exploitation requires local access but no user interaction, and it can compromise confidentiality and integrity without interrupting service.
The record
- CVE
- CVE-2025-53139
- Published
- Oct 14, 2025
- Updated
- Oct 14, 2025
- Vendor
- Microsoft
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- CWE-319
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 14, 2025CVE publishedPublication date reported by the CVE source.
- Oct 14, 2025Record 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.
Weakness, pattern, technique
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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