Submit #801781: mettle sendportal v3.0.1 Insecure direct object reference

Summary
The destroy() method in WorkspaceInvitationsController allows any workspace owner to delete invitations belonging to any other workspace (IDOR - CWE-639).

Vulnerability Details
File: app/Http/Controllers/Workspaces/WorkspaceInvitationsController.php, lines 42-47

public function destroy(Invitation $invitation): RedirectResponse
{
$invitation->delete(); // No workspace ownership check
return redirect()->route('users.index');
}

The route group at routes/web.php line 59 applies OwnsCurrentWorkspace::class middleware, which verifies the user owns their current workspace — but does NOT verify the {invitation} parameter belongs to that workspace. Laravel route model binding resolves ANY invitation by ID.

Secure pattern comparison:

The store() method in the same controller correctly scopes to the current workspace via $request->user()->currentWorkspace(). The invitations table has a workspace_id foreign key but it is never validated in destroy().

Recommended Fix
public function destroy(Invitation $invitation): RedirectResponse
{
abort_unless(
$invitation->workspace_id === auth()->user()->currentWorkspace()->id,
404
);
$invitation->delete();
return redirect()->route('users.index');
}

Disclosure
Found during security research. Happy to provide additional details.

• Source: ⚠️ https://github.com/mettle/sendportal/issues/337
• User: B1scuit (UID 97177)
• Submission: 04/10/2026 06:51 (3 months ago)
• Moderation: 04/26/2026 21:53 (17 days later)
• Status: Accepted
• VulDB entry: 359744 [mettle sendportal up to 3.0.1 Invitation WorkspaceInvitationsController.php destroy invitation authorization]
• Points: 20