SQL Injection Privilege Escalation in Microsoft SQL Server

Successful exploitation allows an authorized low-privileged attacker to elevate privileges in Microsoft SQL Server over the network. The provided CVSS metrics indicate high impact to confidentiality, integrity, and availability, and the supporting content states exploitation could potentially result in administrator-level privileges. In practical terms, this may enable broader access to database contents, unauthorized modification of data or permissions, and disruption of SQL Server availability depending on the privileges obtained.

If immediate patching is not possible, reduce exposure by limiting network access to SQL Server to only trusted hosts and administrative paths, minimizing the number of low-privileged accounts that can authenticate, enforcing least privilege for SQL Server logins and roles, and monitoring for anomalous or unexpected SQL activity from authenticated users. Because the issue is an SQL injection-based privilege escalation flaw, restricting reachable attack surface and authenticated access are the most relevant interim measures based on the available information. The supplied content does not provide any vendor-specific workaround beyond patching.

Apply Microsoft's March 2026 security update for Microsoft SQL Server that addresses CVE-2026-26116. The provided content references the Microsoft Security Response Center advisory for this CVE: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26116. No more specific product build, KB number, or version-by-version patch guidance is included in the supplied material.