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Vulnerabilities/CVE-2026-88092Public Intelligence Dossier
Source: Microsoft · Limited verification•Last verified: •Collection Running
CVE-2026-88092Unknown / EvaluatingImportant (raw)CVSS 9.4CWE-444

ASP.NET Core Tampering 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
9.4Important (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C
Metric sourceMicrosoft MSRC CVRF
EPSS probability
0.8%0.008
Percentile55th
Weakness type
CWE-444
No further CWE recorded
Remediation
Patch status unknown
KB5130034, KB5130036, KB5130035

Why It Matters

Analysis dossier

Why It Matters

Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an unauthorized attacker to perform tampering over a network.

SOC priority

High Severity / Review

Actively exploited

No

Publicly disclosed

Unknown

Risk basis: Microsoft or Microsoft-managed product relevance; CRITICAL severity; Critical CVSS without confirmed KEV exploitation

Affected Products & Remediation

6 source-backed products
Affected products and versions (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
  • ASP.NET Core 8.0 · version range not provided by source · Microsoft MSRC · Source
  • ASP.NET Core 10.0 · version range not provided by source · Microsoft MSRC · Source
  • ASP.NET Core 11.0 · version range not provided by source · Microsoft MSRC · Source
  • ASP.NET Core 9.0 · version range not provided by source · Microsoft MSRC · Source
Recorded patch / KBKB5130034, KB5130036, KB5130035

Vendor or catalog guidance (source)

  • Microsoft MSRC: Release Notes
  • Microsoft MSRC: Install the security update KB5130034 listed by MSRC
  • Microsoft MSRC: Install the security update KB5130036 listed by MSRC
  • Microsoft MSRC: Install the security update KB5130035 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 network-unauthenticated (CVSS AV:N, CVSS PR:N, CVSS UI:N)

Exposure

  1. Identify devices reporting this CVE and note which expose the affected service to untrusted networks.Telemetry: DeviceTvmSoftwareVulnerabilities · A network-reachable, no-privilege vector makes internet-facing instances the first exposure question. · Rule network-unauthenticated

Exploitation evidence

  1. Review inbound connections to the affected service from unexpected sources since the advisory date.Telemetry: DeviceNetworkEvents · Hunting hypothesis from the CVSS vector; it does not show that exploitation occurred. · Rule network-unauthenticated

Response

  1. Confirm the source-stated update is installed and the CVE is no longer reported.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies remediation. · Rule network-unauthenticated

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
cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*, cpe:2.3:a:microsoft:asp.net_core:11.0:rc1:*:*:*:*:*:*, cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*, cpe:2.3:a:microsoft:visual_studio_2026:*:*:*:*:*:*:*:*

Evidence & Provenance

3 public sources
msrc.microsoft.comSource recordapi.msrc.microsoft.comSource recordnvd.nist.govSource 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-2026-88092
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2026-88092
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2026-88092"| 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.