Summary
Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
What privileges could be gained by an attacker who successfully exploited the vulnerability?
An attacker who successfully exploited this vulnerability could gain SQL sysadmin privileges.
How could an attacker exploit this vulnerability?
An authenticated attacker with explicit permissions could exploit the vulnerability by logging in to the SQL server and could then elevate their privileges to sysadmin.
Security updates
14.0.2130.4 — https://support.microsoft.com/help/5122775
15.0.2190.7 — https://support.microsoft.com/help/5122773
14.0.3550.4 — https://support.microsoft.com/help/5122774
16.0.1200.5 — https://support.microsoft.com/help/5122771
17.0.1135.8 — https://support.microsoft.com/help/5122770
15.0.4490.9 — https://support.microsoft.com/help/5122772
17.0.4085.5 — https://support.microsoft.com/help/5122769
16.0.4275.2 — https://support.microsoft.com/help/5122768
Vulnerabilities 1
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High 8.8
SQL Server Elevation of Privilege Vulnerability
Improper access control in SQL 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-2026-77487 SQL Server Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77487
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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