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CVE-2026-77480 Microsoft CVE debrief

CVE-2026-77480 debrief based on CVE Program and NVD records. SQL Server vulnerability allows privilege elevation over a network. The vulnerability has insufficient granularity of access control, allowing an authorized attacker to elevate privileges. Defenders should assess exposure and prioritize patching. This CVE was published on 2026-09-08 and has not been modified since then. The CVE Program and NVD records confirm the vulnerability, and a vendor advisory with patch information is available.

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 should assess exposure and prioritize patching to prevent privilege escalation. This includes verifying vulnerable SQL Server instances, conducting inventory checks, and monitoring for suspicious activity related to privilege escalation. Security teams and vulnerability management teams should also review the CVE details and plan for remediation.

Why it matters

CVE-2026-77480 allows an authorized attacker to elevate privileges over a network. Defenders should prioritize verifying and patching vulnerable SQL Server instances.

  • Verify and patch vulnerable SQL Server instances to prevent privilege escalation
  • Conduct inventory checks to identify exposed systems
  • Monitor for suspicious activity related to privilege escalation

Technical summary

Insufficient granularity of access control in SQL Server allows an authorized attacker to elevate privileges over a network. This vulnerability affects SQL Server deployments, and defenders should prioritize verifying and patching vulnerable instances. The CVE Program and NVD provide official records of the vulnerability, and a vendor advisory with patch information is available.

Defensive priority

Defenders should prioritize verifying and patching vulnerable SQL Server instances.

Recommended defensive actions

  • Verify and apply vendor patches for vulnerable SQL Server instances
  • Conduct inventory checks to identify exposed systems
  • Monitor for suspicious activity related to privilege escalation

Evidence notes

Official CVE Program and NVD records confirm the vulnerability in SQL Server with insufficient access control granularity. Vendor advisory and patch information available. Defenders should verify and patch vulnerable SQL Server instances to prevent privilege escalation. The CVE was published on 2026-09-08T18:20:33.500Z and has not been modified since then.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-77480 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-77480

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

  • CVE-2026-77480 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-77480

    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.