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

June 30, 2026

FolderSchemeHandlerFactory was intended to restrict served files to a configured rootFolder, but its path validation used a raw string prefix check. A request could escape to a sibling directory whose full path starts with the root folder path, allowing files outside the configured root to be served.

References

github.com/advisories/GHSA-85jm-cwp2-mvpv
github.com/cefsharp/CefSharp/security/advisories/GHSA-85jm-cwp2-mvpv
nvd.nist.gov/vuln/detail/CVE-2026-48796

Code Behaviors & Features

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