Summary
Impact: Security Feature Bypass. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
What kind of security feature could be bypassed by successfully exploiting this vulnerability?
An attacker who successfully exploited the vulnerability could evade Mark of the Web (MOTW) defenses.
How could an attacker exploit this vulnerability?
To exploit this security feature bypass vulnerability, an attacker would need to convince a user to launch malicious files using a launcher application that requests that no UI be shown.
According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?
A user needs to be tricked into running malicious files.
Security updates
10.0.17763.7558 — https://support.microsoft.com/help/5062557
10.0.20348.3932 — https://support.microsoft.com/help/5062572
10.0.19044.6093 — https://support.microsoft.com/help/5062554
10.0.22621.5624 — https://support.microsoft.com/help/5062552
10.0.26100.4652 — https://support.microsoft.com/help/5062553
10.0.25398.1732 — https://support.microsoft.com/help/5062570
10.0.10240.21073 — https://support.microsoft.com/help/5062561
10.0.14393.8246 — https://support.microsoft.com/help/5062560
Vulnerabilities 1
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High 8.8
Windows SmartScreen Security Feature Bypass Vulnerability
Protection mechanism failure in Windows SmartScreen allows an unauthorized attacker to bypass a security feature over a network.
Revision history
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#1
Information published.
References
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CVE-2025-49740 Windows SmartScreen Security Feature Bypass Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49740
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss