Shelley Vohr c264402766 fix: validate protocol scheme names in setAsDefaultProtocolClient (#50141) ...

fix: validate protocol scheme names in setAsDefaultProtocolClient

On Windows, `app.setAsDefaultProtocolClient(protocol)` directly
concatenates the protocol string into the registry key path with no
validation. A protocol name containing `\` could write to an arbitrary
subkey under `HKCU\Software\Classes\`, potentially hijacking existing
protocol handlers.

To fix this, add `Browser::IsValidProtocolScheme()` which validates that a protocol
name conforms to the RFC 3986 scheme grammar:

  scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )

This rejects backslashes, forward slashes, whitespace, and any other
characters not permitted in URI schemes.

2026-03-09 18:16:34 +00:00

7.0 KiB

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