The bug is a guard clause doing exactly what it was written to do. According to the exploitation analysis summarised in the report, `Upload::validation()` sees a File Upload field whose first element reports `UPLOAD_ERR_NO_FILE` and exits via `return`, so the extension and file type checks never reach the elements after it [4]. For a single-file field that is correct behaviour: no file, nothing to validate. For a field submitted as an array it means slot one can be empty and slot two can be a `.php` file, which lands in `/wp-content/uploads/elementor/forms/` under a random name [5].
That write becomes code execution only where the web server will run PHP in that directory, at which point the attacker requests the file directly [7]. Stack the preconditions and the population narrows: Elementor Pro at 4.2.1 or earlier [6], a public page carrying a form with a File Upload field that is not set as mandatory [3], and an uploads directory that executes PHP [7]. All three, simultaneously [15]. The flaw is tracked as CVE-2026-32475 and rated critical [13], and the attack needs no user interaction, which is why the report expects victims to notice only at defacement or a strange redirect [14].
The block count is the number that travels, and it measures attacker volume against sites that already had Wordfence's rules in front of them. The report identifies it as a measure of attempts, not compromises [2]. The 5 September review of that write-up exists specifically to separate blocks from compromises and malicious uploads from code execution [12]. For the figure to say anything about your estate, you would need the three conditions above, and the count measures none of them.
Detection has a similar honesty problem. Attack traffic is a multipart POST to `/wp-admin/admin-ajax.php` carrying the `elementor_pro_forms_send_form` action, and an access log that does not record request bodies will not show the array structure at all [10]. Finding the files proves an upload happened, not that anything ran [11]. Confirming execution means process lineage from `php-fpm` or the web process, which the guidance assumes you are collecting [16].
That is what makes the WAF answer weaker than it sounds. Blocking executable uploads is the advice; the report stops short of recommending blocks on array format alone, since normal form submissions use it too [9]. Version 4.2.2 fixes the parser [6]. Refusing to execute PHP under the uploads directory is the control that also covers the next validator that returns too early, and the report is careful to note it is a different control from stopping the upload [8].
