CefSharp up to 148.0.89 FolderSchemeHandlerFactory FolderSchemeHandlerFactory.cs filePath.StartsWith path traversal

Summaryinfo

A vulnerability described as problematic has been identified in CefSharp up to 148.0.89. This vulnerability affects the function filePath.StartsWith of the file CefSharp/SchemeHandler/FolderSchemeHandlerFactory.cs of the component FolderSchemeHandlerFactory. Such manipulation leads to path traversal. This vulnerability is traded as CVE-2026-48796. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in CefSharp up to 148.0.89 and classified as problematic. Affected by this issue is the function filePath.StartsWith of the file CefSharp/SchemeHandler/FolderSchemeHandlerFactory.cs of the component FolderSchemeHandlerFactory. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-48796 since 05/22/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 148.0.90 eliminates this vulnerability.

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Productinfo

Name

• CefSharp

Version

• 148.0.0
• 148.0.1
• 148.0.2
• 148.0.3
• 148.0.4
• 148.0.5
• 148.0.6
• 148.0.7
• 148.0.8
• 148.0.9
• 148.0.10
• 148.0.11
• 148.0.12
• 148.0.13
• 148.0.14
• 148.0.15
• 148.0.16
• 148.0.17
• 148.0.18
• 148.0.19
• 148.0.20
• 148.0.21
• 148.0.22
• 148.0.23
• 148.0.24
• 148.0.25
• 148.0.26
• 148.0.27
• 148.0.28
• 148.0.29
• 148.0.30
• 148.0.31
• 148.0.32
• 148.0.33
• 148.0.34
• 148.0.35
• 148.0.36
• 148.0.37
• 148.0.38
• 148.0.39
• 148.0.40
• 148.0.41
• 148.0.42
• 148.0.43
• 148.0.44
• 148.0.45
• 148.0.46
• 148.0.47
• 148.0.48
• 148.0.49
• 148.0.50
• 148.0.51
• 148.0.52
• 148.0.53
• 148.0.54
• 148.0.55
• 148.0.56
• 148.0.57
• 148.0.58
• 148.0.59
• 148.0.60
• 148.0.61
• 148.0.62
• 148.0.63
• 148.0.64
• 148.0.65
• 148.0.66
• 148.0.67
• 148.0.68
• 148.0.69
• 148.0.70
• 148.0.71
• 148.0.72
• 148.0.73
• 148.0.74
• 148.0.75
• 148.0.76
• 148.0.77
• 148.0.78
• 148.0.79
• 148.0.80
• 148.0.81
• 148.0.82
• 148.0.83
• 148.0.84
• 148.0.85
• 148.0.86
• 148.0.87
• 148.0.88
• 148.0.89

Website

• Product: https://github.com/cefsharp/CefSharp/

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