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CVE-2026-48796— CefSharp: `FolderSchemeHandlerFactory` path boundary check can expose files outside the configured root folder

Quick assessment

Affected
cefsharp CefSharp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CefSharp是cefsharp组织开源的一个Chromium浏览器框架。 CefSharp 148.0.90之前版本存在安全漏洞，该漏洞源于路径前缀检查未强制目录边界，可能导致攻击者通过特制URL访问预期根目录之外的本地文件。

CVSS 5.3 · Medium EPSS 0.29% · P22

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
cefsharp CefSharp < 148.0.90 affected
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I. Basic Information for CVE-2026-48796

Vulnerability Information
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Vulnerability Title
CefSharp: `FolderSchemeHandlerFactory` path boundary check can expose files outside the configured root folder
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
CefSharp 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CefSharp是cefsharp组织开源的一个Chromium浏览器框架。 CefSharp 148.0.90之前版本存在安全漏洞，该漏洞源于路径前缀检查未强制目录边界，可能导致攻击者通过特制URL访问预期根目录之外的本地文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
cefsharp CefSharp < 148.0.90 -

II. Public POCs for CVE-2026-48796

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III. Intelligence Information for CVE-2026-48796

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Patches & Fixes for CVE-2026-48796 (1)

Vendor Advisories for CVE-2026-48796 (1)

Vendor Pages for CVE-2026-48796 (1)

IV. Related Vulnerabilities

Same weakness: CWE-22

V. Comments for CVE-2026-48796

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