CVE-2026-35433

Local privilege escalation via improper input validation

Published May 12, 2026 · Updated May 12, 2026

Improper input validation in affected .NET Windows Desktop runtime releases allows local users to elevate privileges on Windows. Microsoft has not disclosed the input, routine, or precise validation operation that is incorrect in the Windows Desktop runtime. Exploitation requires local execution and user interaction and affects only Windows packages; Microsoft has not identified the privilege boundary crossed.

CVSS severity7.3
High
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in affected .NET Windows Desktop runtime releases allows local users to elevate privileges on Windows. Microsoft has not disclosed the input, routine, or precise validation operation that is incorrect in the Windows Desktop runtime. Exploitation requires local execution and user interaction and affects only Windows packages; Microsoft has not identified the privilege boundary crossed.

The record

CVE
CVE-2026-35433
Published
May 12, 2026
Updated
May 12, 2026
Vendor
Microsoft
Product
.NET 9.0
Classifications
CWE-20, CWE-122, T1068
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.0.0 <9.0.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · .NET 9.0version=9.0.0 <9.0.16
Microsoft · .NET 10.0version=10.0.0 <10.0.8
Microsoft · .NET 8version=8.0.0 <8.0.27

Published CVSS scores

7.3Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-122Heap-based Buffer Overflow
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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