Summary
Impact: Information Disclosure. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
What type of information could be disclosed by this vulnerability?
The type of information that could be disclosed if an attacker successfully exploited this vulnerability is sensitive information.
How could an attacker exploit this vulnerability?
An attacker who successfully exploited this vulnerability could capture screenshots of another user’s session, crossing the user-session boundary.
Security updates
10.0.22621.4751 — https://support.microsoft.com/help/5050021
10.0.26100.2894 — https://support.microsoft.com/help/5050009
Vulnerabilities 1
-
High 7.5
Windows Web Threat Defense User Service Information Disclosure Vulnerability
Windows Web Threat Defense User Service Information Disclosure Vulnerability
Revision history
-
#1
Information published.
References
-
CVE-2025-21343 Windows Web Threat Defense User Service Information Disclosure Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21343
-
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
-
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
-
Common Vulnerability Scoring System
https://www.first.org/cvss