Summary
Impact: Spoofing. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
According to the CVSS metric, successful exploitation of this vulnerability could lead to loss of confidentiality (C:H)? What does that mean for this vulnerability?
Successful exploitation of this vulnerability allows an attacker to impersonate another user and access information based on the victim user's permission levels.
Security updates
10.0.14393.9612 — https://support.microsoft.com/help/5126868
10.0.17763.9376 — https://support.microsoft.com/help/5126651
10.0.20348.5761 — https://support.microsoft.com/help/5126655
10.0.26100.33650 — https://support.microsoft.com/help/5126646
Vulnerabilities 1
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Medium 6.5
Active Directory Federation Services (AD FS) Spoofing Vulnerability
Url redirection to untrusted site ('open redirect') in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
Revision history
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#1
Information published.
References
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CVE-2026-103576 Active Directory Federation Services (AD FS) Spoofing Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-103576
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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