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Vulnerabilities/CVE-2026-70161Public Intelligence Dossier
Source: Microsoft · Limited verification•Last verified: •Collection Degraded
CVE-2026-70161Unknown / EvaluatingImportant (raw)CVSS 7.3CWE-22

.NET Elevation of Privilege Vulnerability

Published: 13 Oct 2026•Last updated: 15 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
7.3Important (raw)
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Metric sourceMicrosoft MSRC CVRF
EPSS probability
0.5%0.005
Percentile39th
Weakness type
CWE-22
No further CWE recorded
Remediation
Patch status unknown
KB5130035, KB5130036

Why It Matters

Analysis dossier

Why It Matters

Improper limitation of a pathname to a restricted directory ('path traversal') in .NET allows an authorized attacker to elevate privileges locally.

SOC priority

Review

Actively exploited

No

Publicly disclosed

Unknown

Risk basis: Microsoft or Microsoft-managed product relevance; HIGH severity

Affected Products & Remediation

5 source-backed products
Affected products and versions (source)
  • .NET 11.0 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
  • .NET 10.0 installed on Windows · version range not provided by source · Microsoft MSRC · Source
  • Microsoft Visual Studio 2026 version 18.10 · 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
Recorded patch / KBKB5130035, KB5130036

Vendor or catalog guidance (source)

  • Microsoft MSRC: Release Notes
  • Microsoft MSRC: Install the security update KB5130035 listed by MSRC
  • Microsoft MSRC: Install the security update KB5130036 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 microsoft-enterprise (Affected product: .NET 11.0 installed on Windows, Vendor: Microsoft); path-traversal (CWE-22)

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. Locate affected deployments and the path-handling endpoint named by the advisory.Telemetry: Application access logs · The affected path must come from the source, not the CWE alone. · Rule path-traversal

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 requests to that endpoint for traversal encodings and unusual file responses.Telemetry: Application access logs · Such patterns are a hypothesis to validate against normal traffic. · Rule path-traversal

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
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-2026-70161
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2026-70161
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2026-70161"| 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.