CVE-2026-62909 Microsoft CVE debrief

Who should care

Defenders responsible for .NET and Microsoft Visual Studio deployments should assess exposure and prioritize patching to prevent local privilege escalation.

Why it matters

CVE-2026-62909 is a .NET Elevation of Privilege Vulnerability that allows an authorized attacker to elevate privileges locally due to an uncaught exception. Defenders responsible for .NET and Microsoft Visual Studio deployments should assess exposure and prioritize patching to prevent local privilege escalation. The vulnerability affects multiple .NET versions and Microsoft Visual Studio versions, and patching is crucial to prevent exploitation. Verify affected versions in your inventory and prioritize remediation due to the potential for privilege escalation.

• Local privilege escalation requires immediate attention from defenders
• Patching affected versions is crucial to prevent exploitation
• Verify affected .NET and Microsoft Visual Studio versions in your inventory
• Remediation priority is high due to the potential for privilege escalation

Technical summary

The .NET Elevation of Privilege Vulnerability occurs due to an uncaught exception in .NET, allowing an authorized attacker to elevate privileges locally. Affected versions include .NET 10.0 below 10.0.11, .NET 8.0 below 8.0.30, .NET 9.0 below 9.0.19, Microsoft Visual Studio 2022 version 17.14 below 17.14.38, and Microsoft Visual Studio 2026 version 18.8 below 18.8.3.

Defensive priority

Defenders should prioritize patching affected .NET and Microsoft Visual Studio versions to prevent local privilege escalation.

Recommended defensive actions

• Patch affected .NET 10.0 versions below 10.0.11
• Patch affected .NET 8.0 versions below 8.0.30
• Patch affected .NET 9.0 versions below 9.0.19
• Patch affected Microsoft Visual Studio 2022 version 17.14 below 17.14.38
• Patch affected Microsoft Visual Studio 2026 version 18.8 below 18.8.3

Evidence notes

The CVE record and source item provide details on the vulnerability, but additional information on exploitation and impact is limited. There is no information on known or suspected exploitation. Defenders should verify affected .NET and Microsoft Visual Studio versions in their inventory and prioritize remediation due to the potential for privilege escalation. The official CVE Program record and NIST NVD detail page provide source-provided CVE metadata and vulnerability assessment, but

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.