High-privilege network security feature bypass
Published Apr 8, 2025 · Updated Aug 10, 2026
Weak authentication in Windows Hello on affected Windows releases allows remote authenticated users to bypass a security feature. Microsoft has not disclosed which Windows Hello authentication check is weak or how it mishandles network input. Exploitation requires high privileges and network access and compromises confidentiality and integrity without reported service interruption.
Summary
What happened
Weak authentication in Windows Hello on affected Windows releases allows remote authenticated users to bypass a security feature. Microsoft has not disclosed which Windows Hello authentication check is weak or how it mishandles network input. Exploitation requires high privileges and network access and compromises confidentiality and integrity without reported service interruption.
The record
- CVE
- CVE-2025-26635
- Published
- Apr 8, 2025
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-1390
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Apr 8, 2025CVE publishedPublication date reported by the CVE source.
- Aug 10, 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=10.0.17763.0 <10.0.17763.7136
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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