---
id: CVE-2026-65810
title: .NET Framework Elevation of Privilege Vulnerability
summary: >-
  Relative path traversal in .NET Framework allows an unauthorized attacker to
  elevate privileges locally.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-23
vendor: Microsoft
product: Microsoft .NET Framework 3.5
affected:
  - .net_framework_3.5 >= 3.5.0 < 2.0.50727.9183 & 3.0.30729.9169
  - >-
    .net_framework_3.5_and_4.6.2_4.7_4.7.1_4.7.2 >= 3.0.0.0 < 2.0.50727.8984 &
    3.0.30729.8980 & 4.7.4144.0
  - >-
    .net_framework_3.5_and_4.7.2 >= 4.7.0 < 2.0.50727.9070 & 3.0.30729.9068 &
    4.7.4144.0
  - >-
    .net_framework_3.5_and_4.8 >= 4.8.0 < 2.0.50727.9070 & 3.0.30729.9068 &
    4.8.4805.0
  - >-
    .net_framework_3.5_and_4.8.1 >= 4.8.1 < 2.0.50727.9183 & 3.0.30729.9169 &
    4.8.9343.0
  - .net_framework_4.6.2_4.7_4.7.1_4.7.2 >= 4.7.0 < 4.7.4144.0
  - .net_framework_4.8 >= 4.8.0 < 4.8.4805.0
  - .net_framework_4.8.1 >= 4.8.0.0 < 4.8.9344.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-12T03:55:38.464741Z'
published: '2026-08-11'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T13:47:13.139Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-65810'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65810'
    label: .NET Framework Elevation of Privilege Vulnerability
tags:
  - cve.org
epss: 0.00404
epssPercentile: 0.31826
ingestedAt: '2026-09-08T18:07:34.888Z'
---

## Overview

Relative path traversal in .NET Framework allows an unauthorized attacker to elevate privileges locally.

## Affected

- `.net_framework_3.5 >= 3.5.0 < 2.0.50727.9183 & 3.0.30729.9169`
- `.net_framework_3.5_and_4.6.2_4.7_4.7.1_4.7.2 >= 3.0.0.0 < 2.0.50727.8984 & 3.0.30729.8980 & 4.7.4144.0`
- `.net_framework_3.5_and_4.7.2 >= 4.7.0 < 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4144.0`
- `.net_framework_3.5_and_4.8 >= 4.8.0 < 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0`
- `.net_framework_3.5_and_4.8.1 >= 4.8.1 < 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0`
- `.net_framework_4.6.2_4.7_4.7.1_4.7.2 >= 4.7.0 < 4.7.4144.0`
- `.net_framework_4.8 >= 4.8.0 < 4.8.4805.0`
- `.net_framework_4.8.1 >= 4.8.0.0 < 4.8.9344.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.