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Vulnerabilities/CVE-2026-69439Public Intelligence Dossier
Source: Microsoft · Limited verification•Last verified: •Collection Degraded
CVE-2026-69439Unknown / EvaluatingImportant (raw)CVSS 8.8

.NET and Visual Studio Elevation of Privilege Vulnerability

Published: 08 Sept 2026•Last updated: 25 Sept 2026, 12:30 PM IST•Source identifier: Unknown
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:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Metric sourceMicrosoft MSRC CVRF
EPSS probability
0.8%0.008
Percentile57th
Weakness type
—
No further CWE recorded
Remediation
Patch status unknown
KB5126106, KB5126104, KB5126105

Why It Matters

Analysis dossier

Why It Matters

Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to elevate privileges over a network.

SOC priority

Review

Actively exploited

No

Publicly disclosed

Unknown

Risk basis: No confirmed exploitation signal in current enrichment

Affected Products & Remediation

6 source-backed products
Affected products and versions (source)
  • .NET 10.0 installed on Windows · version range not provided by source · Microsoft MSRC · Source
  • .NET 8.0 installed on Windows · version range not provided by source · Microsoft MSRC · Source
  • .NET 9.0 installed on Windows · version range not provided by source · Microsoft MSRC · Source
  • Microsoft Visual Studio 2022 version 17.14 · version range not provided by source · Microsoft MSRC · Source
  • Microsoft Visual Studio 2026 version 18.9 · version range not provided by source · Microsoft MSRC · Source
  • .NET 11.0 installed on Windows · version range not provided by source · Microsoft MSRC · Source
Recorded patch / KBKB5126106, KB5126104, KB5126105

Vendor or catalog guidance (source)

  • Microsoft MSRC: Install the security update KB5126106 listed by MSRC
  • Microsoft MSRC: Install the security update KB5126104 listed by MSRC
  • Microsoft MSRC: Install the security update KB5126105 listed by MSRC
  • Microsoft MSRC: Release Notes

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 microsoft-enterprise (Affected product: .NET 10.0 installed on Windows, Vendor: Microsoft); user-interaction-client (CVSS AV:N, CVSS UI:R)

Exposure

  1. Identify affected Microsoft products and compare local builds with the MSRC advisory.Telemetry: DeviceTvmSoftwareVulnerabilities · The MSRC product/build mapping establishes applicability. · Rule microsoft-enterprise
  2. Identify endpoints reporting this CVE, especially those used for email and web browsing.Telemetry: DeviceTvmSoftwareVulnerabilities · A network vector that needs user interaction points at user-facing client software. · Rule user-interaction-client

Exploitation evidence

  1. Review the advisory's documented behavior on matching hosts before selecting a hunt.Telemetry: DeviceProcessEvents · Product family alone does not justify a CVE-specific detection. · Rule microsoft-enterprise
Show more (2)

Exploitation evidence

  1. Review unusual child processes started by the affected client application on affected endpoints.Telemetry: DeviceProcessEvents · Hunting hypothesis from the CVSS vector; it does not show that exploitation occurred. · Rule user-interaction-client

Response

  1. Confirm the source-stated KB or mitigation on matching assets.Telemetry: DeviceTvmSoftwareVulnerabilities · A post-update inventory check verifies remediation. · Rule microsoft-enterprise

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
Unknown
Record status · verification
UPDATED · Unknown
CPE
Unknown

Evidence & Provenance

1 public source
api.msrc.microsoft.comSource record
Detection Hunting Query

— No published hunting query names this record. Browse community and library queries instead.

Open KQL Library

Correlated briefings

Microsoft Security Update Guide · Limited verificationSeptember 2026 Security UpdatesPublished 08 Sept 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.