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CVE-2026-77487 Microsoft CVE debrief

CVE-2026-77487 debrief based on the supplied source corpus. The CVE record was published on 2026-09-08T18:20:34.397Z and has not been modified since then. The vulnerability is caused by improper access control in SQL Server, allowing an authorized attacker to elevate privileges over a network. Affected versions include SQL Server 2017, 2019, 2022, and 2025. Defenders should prioritize verifying and applying patches for SQL Server, especially for versions 2017, 2019, 2022, and 2025, as an authorized attacker could elevate privileges over a network.

Vendor
Microsoft
Product
Microsoft SQL Server 2017 (CU 31)
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-15
Advisory published
2026-09-08
Advisory updated
2026-09-15

Who should care

Defenders responsible for SQL Server deployments, especially those using versions 2017, 2019, 2022, and 2025, should assess exposure and prioritize patching.

Why it matters

Defenders should prioritize verifying and applying patches for SQL Server, especially for versions 2017, 2019, 2022, and 2025, as an authorized attacker could elevate privileges over a network.

  • Verify and apply patches to prevent privilege elevation
  • Review and update access controls to prevent unauthorized access
  • Monitor for suspicious activity to detect potential exploitation

Technical summary

The vulnerability is caused by improper access control in SQL Server, allowing an authorized attacker to elevate privileges over a network. Affected versions include SQL Server 2017, 2019, 2022, and 2025. The vulnerability can be exploited by an authorized attacker to elevate privileges, and defenders should prioritize verifying and applying patches for SQL Server, especially for versions 2017, 2019, 2022, and 2025.

Defensive priority

Defenders should prioritize verifying and applying patches for SQL Server, especially for versions 2017, 2019, 2022, and 2025, as an authorized attacker could elevate privileges over a network.

Recommended defensive actions

  • Verify and apply patches for SQL Server versions 2017, 2019, 2022, and 2025
  • Review and update access controls for SQL Server to prevent unauthorized privilege elevation
  • Monitor SQL Server for suspicious activity

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, but specific details on exploitation and impact are limited. There is no evidence of exploitation in the wild, but defenders should verify and apply patches for SQL Server versions 2017, 2019, 2022, and 2025. The CVE Program record and NVD detail page provide official information on the vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-77487 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-77487

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-77487 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-77487

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.