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CVE-2026-20803 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-01-13T18:16:06.630Z and has not been modified since then. CVE-2026-20803 is a high-severity vulnerability in Microsoft SQL Server 2022 and 2025. The vulnerability, caused by missing authentication for a critical function, allows an authorized attacker to elevate privileges over a network. The CVSS score is 7.2. Affected versions include SQL Server 2022 prior to 16.0.1165.1 and 16.0.4230.2, as well as SQL Server 2025 version 17.0.1000.7. Organizations should prioritize patching and monitoring. Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up. Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed. Review compensating controls for exposed systems while remediation is scheduled and verified. Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Vendor
Microsoft
Product
Microsoft SQL Server 2022 (GDR)
CVSS
HIGH 7.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-13
Original CVE updated
2026-07-30
Advisory published
2026-01-13
Advisory updated
2026-07-30

Who should care

Organizations using Microsoft SQL Server 2022 and 2025, particularly those with network-exposed SQL Server instances or high-privilege user accounts, should prioritize patching and monitoring.

Technical summary

CVE-2026-20803 is a high-severity vulnerability in Microsoft SQL Server 2022 and 2025. The vulnerability, caused by missing authentication for a critical function, allows an authorized attacker to elevate privileges over a network. The CVSS score is 7.2. Affected versions include SQL Server 2022 prior to 16.0.1165.1 and 16.0.4230.2, as well as SQL Server 2025 version 17.0.1000.7. The vulnerability is tracked under CWE-306.

Defensive priority

Organizations using Microsoft SQL Server 2022 and 2025 should prioritize patching, focusing on versions within the vulnerable ranges.

Recommended defensive actions

  • Apply patches for SQL Server 2022 and 2025
  • Inventory SQL Server installations for vulnerable versions
  • Implement compensating controls for network access
  • Monitor for suspicious privilege escalation attempts
  • Verify authentication mechanisms for critical SQL Server functions

Evidence notes

The CVE-2026-20803 record indicates a missing authentication vulnerability in Microsoft SQL Server 2022 and 2025. The vulnerability allows an authorized attacker to elevate privileges over a network. The CVSS score is 7.2, indicating high severity. Affected versions include SQL Server 2022 prior to 16.0.1165.1 and 16.0.4230.2, as well as SQL Server 2025 version 17.0.1000.7.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-20803 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-20803

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

  • CVE-2026-20803 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-20803

    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.