Summary
Impact: Spoofing. Microsoft rating: Important. Not known to be exploited. Customer action: Required.
Details
How could an attacker exploit the vulnerability?
An attacker would have to convince a user to visit a malicious website, typically via an enticement in email or instant message, or by getting them to open an email attachment.
The attack vector is address bar spoofing. A malicious website could spoof the contents of a URL bar via a specially crafted HTML page's long URL and then use it for a phishing attack.
According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?
This vulnerability requires that a user with an affected version of Windows access a malicious server. An attacker would have to host a specially crafted server share or website. An attacker would have no way to force users to visit this specially crafted server share or website, but would have to convince them to visit the server share or website, typically by way of an enticement in an email or chat message.
Security updates
2.6.7 — https://techcommunity.microsoft.com/blog/Windows-Admin-Center-Blog/windows-admin-center-version-2511-is-now-generally-available/4477048
Vulnerabilities 1
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Medium 6.1
Windows Admin Center Spoofing Vulnerability
Improper neutralization of input during web page generation ('cross-site scripting') in Windows Admin Center allows an unauthorized attacker to perform spoofing over a network.
Revision history
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#2
Corrected Build Number in the Security Updates table. This is an informational change only.
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#1
Information published.
References
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CVE-2026-58643 Windows Admin Center Spoofing Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58643
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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