Summary
Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
How could an attacker exploit the vulnerability?
To exploit this vulnerability, an attacker could execute a specially crafted script to coerce the victim machine to connect back to the attacker’s SMB Server using SMB and authenticate. This could result in elevation of privilege.
What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
The Attack requires an Service Principal Name (SPN) that is registered to an account that no longer exists or is not in use, to be on the target machine.
Security updates
10.0.26200.6899 — https://support.microsoft.com/help/5066835
10.0.17763.7919 — https://support.microsoft.com/help/5066586
10.0.20348.4294 — https://support.microsoft.com/help/5066782
10.0.19044.6456 — https://support.microsoft.com/help/5066791
10.0.22621.6060 — https://support.microsoft.com/help/5066793
10.0.25398.1913 — https://support.microsoft.com/help/5066780
10.0.10240.21161 — https://support.microsoft.com/help/5066837
10.0.14393.8519 — https://support.microsoft.com/help/5066836
6.0.6003.23571 — https://support.microsoft.com/help/5066874
6.0.6003.23571 — https://support.microsoft.com/help/5066877
6.1.7601.27974 — https://support.microsoft.com/help/5066872
6.1.7601.27974 — https://support.microsoft.com/help/5066876
6.2.9200.25722 — https://support.microsoft.com/help/5066875
6.3.9600.22824 — https://support.microsoft.com/help/5066873
Vulnerabilities 1
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High 7.5CVE-2025-58726 Public exploit
Windows SMB Server Elevation of Privilege Vulnerability
Improper access control in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Revision history
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#1
Information published.
References
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CVE-2025-58726 Windows SMB Server Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-58726
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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