Summary
Impact: Spoofing. Microsoft rating: Important. Not known to be exploited, publicly disclosed before the fix — Exploitation Less Likely. Customer action: Required.
Details
According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?
An attacker would have to convince the user to load a malicious file onto a vulnerable system, typically by way of an enticement in an Email or Instant Messenger message, and then convince the user to manipulate the specially crafted file, but not necessarily click or open the malicious file.
Security updates
10.0.17763.6775 — https://support.microsoft.com/help/5050008
10.0.20348.3091 — https://support.microsoft.com/help/5049983
10.0.19044.5371 — https://support.microsoft.com/help/5049981
10.0.22621.4751 — https://support.microsoft.com/help/5050021
10.0.26100.2894 — https://support.microsoft.com/help/5050009
10.0.10240.20890 — https://support.microsoft.com/help/5050013
10.0.14393.7699 — https://support.microsoft.com/help/5049993
6.2.9200.25273 — https://support.microsoft.com/help/5050004
6.3.9600.22371 — https://support.microsoft.com/help/5050048
Vulnerabilities 1
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Medium 6.5
Windows Themes Spoofing Vulnerability
Windows Themes Spoofing Vulnerability
Revision history
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#1
Information published.
References
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CVE-2025-21308 Windows Themes Spoofing Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21308
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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