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Vulnerabilities/CVE-2026-65674Public Intelligence Dossier
Source: Microsoft · Limited verification•Last verified: •Collection Degraded
CVE-2026-65674Unknown / EvaluatingImportant (raw)CVSS 8.8CWE-502

Microsoft SQL Server Remote Code Execution Vulnerability

Published: 13 Oct 2026•Last updated: 13 Oct 2026, 12:30 PM IST•Source identifier: secure@microsoft.com
Dossier completeness: source-provided sections 3 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
8.8Important (raw)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Metric sourceMicrosoft MSRC CVRF
EPSS probability
0.9%0.009
Percentile58th
Weakness type
CWE-502
No further CWE recorded
Remediation
Patch status unknown
KB5126934, KB5126967, KB5128495, KB5128493, KB5128492, KB5128494

Why It Matters

Analysis dossier

Why It Matters

Deserialization of untrusted data in SQL Server allows an authorized attacker to execute code over a network.

SOC priority

High

Actively exploited

No

Publicly disclosed

Unknown

Risk basis: Microsoft or Microsoft-managed product relevance; HIGH severity; No confirmed exploitation signal in current enrichment

Affected Products & Remediation

6 source-backed products
Affected products and versions (source)
  • Microsoft SQL Server 2022 for x64-based Systems (CU27) · version range not provided by source · Microsoft MSRC · Source
  • Microsoft SQL Server 2025 for x64-based Systems (CU9) · version range not provided by source · Microsoft MSRC · Source
  • Microsoft SQL Server 2019 for x64-based Systems (GDR) · version range not provided by source · Microsoft MSRC · Source
  • Microsoft SQL Server 2022 for x64-based Systems (GDR) · version range not provided by source · Microsoft MSRC · Source
  • Microsoft SQL Server 2025 for x64-based Systems (GDR) · version range not provided by source · Microsoft MSRC · Source
  • Microsoft SQL Server 2019 for x64-based Systems (CU32) · version range not provided by source · Microsoft MSRC · Source
Recorded patch / KBKB5126934, KB5126967, KB5128495, KB5128493, KB5128492, KB5128494

Vendor or catalog guidance (source)

  • Microsoft MSRC: Install the security update KB5126934 listed by MSRC
  • Microsoft MSRC: Install the security update KB5126967 listed by MSRC
  • Microsoft MSRC: Install the security update KB5128495 listed by MSRC
  • Microsoft MSRC: Install the security update KB5128493 listed by MSRC
  • Microsoft MSRC: Install the security update KB5128492 listed by MSRC

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
No
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched deserialization (CWE-502)

Exposure

  1. Find installations of the affected component and confirm the source-stated version range.Telemetry: Application inventory · Deserialization risk requires component and version evidence. · Rule deserialization

Exploitation evidence

  1. Review unusual child processes or network connections from the affected service.Telemetry: DeviceProcessEvents · Unexpected behavior may support investigation but is not proof by itself. · Rule deserialization

Response

  1. Verify the vendor update or mitigation on each affected installation.Telemetry: Application change records · Response must follow the authoritative source guidance. · Rule deserialization

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
secure@microsoft.com
Record status · verification
UPDATED · Unknown
CPE
Unknown

Evidence & Provenance

3 public sources
api.msrc.microsoft.comSource recordnvd.nist.govSource recordmsrc.microsoft.comSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2026-65674
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2026-65674
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2026-65674"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

Correlated briefings

Microsoft Security Update Guide · Limited verificationOctober 2026 Security UpdatesPublished 13 Oct 2026
SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.