Re: Blob URL Origin

On Mon, May 19, 2014 at 3:30 AM, Jonas Sicking <jonas@sicking.cc> wrote:

> In at least Chrome and Firefox, blob: acts like filesystem: and can't
>
be loaded cross-origin. Even in cases when we normally permit loading
> of cross-origin resources like in <img> and <script>.
>
> This has been to prevent websites from being able to steal data by
> guessing UUIDs (at least the Gecko UUID generator isn't guaranteed to
> produce unguessable UUIDs).
>

Again, generating securely unguessable tokens (whether in UUID format or
not) is straightforward, so this seems doesn't seem like a reason to block
cross-origin blob URLs.

-- 
Glenn Maynard