Microsoft SQL Server: 25 Vulnerabilities Disclosed in September 2026 Patch Tuesday Batch
Key findings • Microsoft SQL Server: 25 vulnerabilities disclosed on September 8, 2026. • Multiple high-severity flaws allow for remote code execution and privilege escalation. • Vulnerab…
Key findings
- Microsoft SQL Server: 25 vulnerabilities disclosed on September 8, 2026.
- Multiple high-severity flaws allow for remote code execution and privilege escalation.
- Vulnerabilities include heap-based buffer overflows, improper access control, and use-after-free flaws.
- Information disclosure vulnerabilities also present, enabling access to sensitive data.
- Users urged to apply September 2026 security updates to mitigate risks.
Microsoft released a significant batch of 25 vulnerabilities for its SQL Server product on September 8, 2026. This coordinated disclosure, part of the September Patch Tuesday, includes a mix of critical and high-severity flaws, with several allowing for remote code execution and privilege escalation. The sheer volume and severity of these vulnerabilities underscore the ongoing importance of timely patching for database systems.
The disclosed vulnerabilities span various attack vectors and bug classes. Several heap-based buffer overflow vulnerabilities, including CVE-2026-78456, CVE-2026-77482, CVE-2026-77481, CVE-2026-68786, and CVE-2026-68775, could allow an authorized attacker to execute code over a network. Additionally, CVE-2026-68784 presents a heap-based buffer overflow allowing local code execution.
Privilege escalation is another major concern, with multiple vulnerabilities enabling unauthorized access. CVE-2026-77487, CVE-2026-77483, CVE-2026-77480, and CVE-2026-73028 are improper access control or weak authentication flaws that could lead to elevated privileges over a network. CVE-2026-77485, a use-after-free vulnerability, also allows for local privilege escalation.
Information disclosure is also present, with CVE-2026-77488 (integer underflow) and CVE-2026-73029, CVE-2026-69562, CVE-2026-68784, CVE-2026-68785, CVE-2026-68781, CVE-2026-68780, CVE-2026-68779, CVE-2026-68778, CVE-2026-68777, and CVE-2026-67648 (various out-of-bounds reads and use of uninitialized resources) potentially allowing attackers to gain sensitive information. CVE-2026-77486, an integer overflow, could also lead to code execution.
While the provided information does not specify active exploitation in the wild for these particular SQL Server vulnerabilities, the related news coverage from Rapid7 and Cyber Security News indicates that Microsoft was aware of exploitation in the wild for two zero-day vulnerabilities disclosed on the same day, though not specifically linked to SQL Server in the excerpts. Organizations should remain vigilant and prioritize patching all disclosed vulnerabilities.
Microsoft has addressed these vulnerabilities through its regular Patch Tuesday updates. Users are advised to update their SQL Server instances to the latest available versions to mitigate these risks. Specific version information for the patches is not detailed in the provided CVE descriptions, but it is standard practice for Microsoft to release cumulative updates addressing such issues.
This batch of 25 vulnerabilities highlights the critical need for robust security practices around Microsoft SQL Server. The potential for remote code execution and privilege escalation means that successful exploitation could lead to complete system compromise. Organizations must ensure they have a diligent patching schedule and robust monitoring in place to protect their database environments. The sheer volume of vulnerabilities disclosed by Microsoft on this date, totaling 973 across all products, emphasizes the ongoing challenges in securing complex software ecosystems.