Hi Mark,

Email phishing via HTML forms is not uncommon now but usually done via 
attachments.  Being able to do it inline within
the email probably would not help the situation any. :)
  Lucas.

On 2/24/2012 2:09 AM, Mark Banner wrote:
> Since Thunderbird 2, we've had a bug on file [1] where forms in email can't 
> be submitted. This was due to how we
> changed our content handling to allow tabs that can view web pages.
>
> Whilst I think we could fix this, the more I think about it, the more I am 
> concerned about the security implications
> of forms in emails.
>
> I think the biggest concern is from phishing attacks - e.g. a user receives 
> an email with form elements due to their
> bank having issues and needing to log in.
>
> With no indication of where the submission is going to, the user could be at 
> serious risk.
>
> I should note, this is only a problem where the user selects to view 
> "Original HTML". Viewing plain text or "Simple
> HTML" isn't an issue.
>
> So I don't think it is right to "fix" form handling to just work as it used 
> to, but I'm not sure about the way forward.
>
> I can see a couple of options:
>
> - Don't allow the display of the form at all, even in original html mode.
> - Somehow hook into the form submission, or the email display and indicate 
> where the form will be submitted to.
>
> I'm not sure if the latter is possible, or sensible from a security 
> perspective.
>
> Does anyone else have any ideas, suggestions, comments?
>
> Mark.
>
> [1] https://bugzilla.mozilla.org/show_bug.cgi?id=533545
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