PDFCrowd Save as PDF Plugin up to 4.6.1 on WordPress Shortcode save_as_pdf_pdfcrowd pdf_created_callback code injection

Summaryinfo

A vulnerability was found in PDFCrowd Save as PDF Plugin up to 4.6.1. It has been classified as critical. This vulnerability affects the function save_as_pdf_pdfcrowd of the component Shortcode Handler. This manipulation of the argument pdf_created_callback causes code injection. The identification of this vulnerability is CVE-2026-92807. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in PDFCrowd Save as PDF Plugin up to 4.6.1 and classified as critical. Affected by this vulnerability is the function save_as_pdf_pdfcrowd of the component Shortcode Handler. The manipulation of the argument pdf_created_callback with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at wordfence.com. This vulnerability is known as CVE-2026-92807 since 09/16/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/19/2026). The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Vendor

• PDFCrowd

Name

• Save as PDF Plugin

Version

• 4.6.0
• 4.6.1

CPE 2.3info

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CPE 2.2info

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