The Save as PDF Plugin by PDFCrowd plugin for WordPress is vulnerable to Arbitrary Function Invocation in all versions up to, and including, 4.6.1 via the `pdf_created_callback` shortcode attribute

Overview

The Save as PDF Plugin by PDFCrowd plugin for WordPress is vulnerable to Arbitrary Function Invocation in all versions up to, and including, 4.6.1 via the pdf_created_callback shortcode attribute. The eval_shortcode() function copies any non-button_/non-email_ shortcode attribute verbatim into a custom options array without sanitization, allowlist enforcement, or capability checks, and create_button() AES-encrypts that array — including the attacker-supplied callback value — and embeds the resulting blob in the rendered button HTML; when the blob is later POSTed to the unauthenticated wp_ajax_nopriv_save_as_pdf_pdfcrowd endpoint, save_as_pdf_pdfcrowd() decrypts it and invokes $options['pdf_created_callback'] as a PHP callable at line 1722 with no is_callable() guard, no allowlist, and no capability check. This makes it possible for authenticated attackers, with Contributor-level access and above, to invoke arbitrary PHP functions or static class methods with plugin option data as the sole argument, enabling disclosure of the site's stored PDFCrowd API key and username or further server-side abuse. Note that the encryption boundary does not mitigate this vector because the server itself encrypts the attacker-chosen callback during shortcode rendering, supplying any authenticated Contributor with a cryptographically valid blob that any unauthenticated visitor can subsequently replay to trigger invocation.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.