---
id: CVE-2026-48796
title: >-
  CefSharp provides .NET bindings for the Chromium Embedded Framework for
  Windows Forms and Windows Presentation Foundation applications
summary: >-
  CefSharp provides .NET bindings for the Chromium Embedded Framework for
  Windows Forms and Windows Presentation Foundation applications. Prior to
  version 148.0.90, CefSharp/SchemeHandler/FolderSchemeHandlerFactory.cs used
  filePath.StartsW…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-22
vendor: CefSharp
product: CefSharp.Common
affected:
  - CefSharp.Common < 148.0.90
patched:
  - CefSharp.Common 148.0.90
published: '2026-08-18'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:13:25.910'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-48796'
references:
  - url: >-
      https://github.com/cefsharp/CefSharp/commit/3475c7ef14119f67ec3720866bb3e4b1c6c68632
    label: security-advisories@github.com
  - url: 'https://github.com/cefsharp/CefSharp/releases/tag/v148.0.90'
    label: security-advisories@github.com
  - url: >-
      https://github.com/cefsharp/CefSharp/security/advisories/GHSA-85jm-cwp2-mvpv
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-85jm-cwp2-mvpv'
tags:
  - nvd
  - ghsa
  - nuget
epss: 0.00395
epssPercentile: 0.30939
ecosystem: nuget
ingestedAt: '2026-06-30T21:24:14.397Z'
---

## Overview

CefSharp provides .NET bindings for the Chromium Embedded Framework for Windows Forms and Windows Presentation Foundation applications. Prior to version 148.0.90, CefSharp/SchemeHandler/FolderSchemeHandlerFactory.cs used filePath.StartsWith(rootFolder, StringComparison.OrdinalIgnoreCase) to decide whether a decoded and canonicalized request path remained inside rootFolder. That raw prefix test did not enforce a directory boundary, so a request such as ..%2fwww2/secret.txt could escape a configured www directory into a sibling www2 directory whose path shared the same string prefix. Applications that register FolderSchemeHandlerFactory for a custom scheme or an HTTP or HTTPS scheme can therefore serve local files outside the intended root when an attacker can cause the embedded browser to request the crafted URL. The issue affects both Unix-style paths such as /tmp/app/www2 and Windows paths such as C:\app\www2, and the fix appends a directory separator to the normalized root before comparison while rejecting null bytes and alternate data stream syntax. This issue is fixed in version 148.0.90.

## Remediation

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

## Package advisory (CVE-2026-48796)

Affected packages:

- `CefSharp.Common < 148.0.90`

Patched in:

- `CefSharp.Common 148.0.90`

Source: https://github.com/advisories/GHSA-85jm-cwp2-mvpv