CVE-2026-48796

CefSharp's FolderSchemeHandlerFactory used a raw string-prefix check (filePath.StartsWith(rootFolder)) that allowed ..%2fwww2/secret.txt to escape a www root into a sibling www2 directory, exposing local files. Fixed in version 148.0.90 by appending a directory separator to the normalized root be...

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

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.StartsWithrootFolder, StringComparison.OrdinalIgnoreCase to decide...