SQL Server Improper Access Control Privilege Elevation
Severe, but no confirmed exploitation yet. Schedule remediation in your next patch cycle and apply mitigations if you're exposed.
An attacker with a basic user account, remotely over the network, with no user interaction, can fully compromise the system — steal data, tamper with it and take it offline.
Improper access control in SQL Server allows an authorized attacker to elevate privileges over a network.
Inferred from the weakness type (CWE) and how the flaw is reached — the techniques an attacker would chain to exploit this. Real-world corroboration appears here as threat intel is folded in.
Generated by Wavense from the CVE record — an immediate mitigation and the permanent fix.
Restrict network access to SQL Server instances via firewall rules, allowing connections only from trusted hosts and applications to minimize attack surface. Enforce the principle of least privilege for all SQL Server users and service accounts, ensuring they have only the necessary permissions to function. Implement robust logging and monitoring for suspicious access patterns, privilege escalation attempts, or unauthorized network connections to the SQL Server.
Apply the official security updates released by Microsoft specifically addressing CVE-2026-77487 for all affected SQL Server versions immediately. Organizations should verify the successful installation of the patch and conduct post-patch validation to ensure the vulnerability is fully remediated and no new issues are introduced. Regularly review and update SQL Server configurations and versions to stay current with security best practices.
An authorized attacker can exploit this vulnerability to elevate their privileges within the SQL Server instance over the network. This grants them full administrative control over all databases, enabling data exfiltration, modification, deletion, and potential compromise of connected applications or further lateral movement within the enterprise network. The business consequences include severe data breaches, service disruption, compliance failures, and significant reputational damage.
Other CVEs affecting sql server 2017
A remote code execution vulnerability exists in Microsoft SQL Server when it incorrectly handles processing of internal functions, aka 'Microsoft SQL Server Remote Code Execution Vulnerability'.
Heap-based buffer overflow in SQL Server allows an unauthorized attacker to execute code over a network.
Heap-based buffer overflow in SQL Server allows an unauthorized attacker to execute code over a network.
Deserialization of untrusted data in SQL Server allows an unauthorized attacker to execute code over a network.
Deserialization of untrusted data in SQL Server allows an unauthorized attacker to execute code over a network.
Out-of-bounds read in SQL Server allows an unauthorized attacker to execute code over a network.