Printcart Store Plugin up to 2.13.2 on WordPress nbu_crop_image AJAX handler convert_url_to_path url unrestricted upload

Summaryinfo

A vulnerability classified as critical has been found in Printcart Store Plugin up to 2.13.2. This impacts the function Nbdesigner_IO::convert_url_to_path of the component nbu_crop_image AJAX handler. The manipulation of the argument url leads to unrestricted upload. This vulnerability is documented as CVE-2026-19803. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Printcart Store Plugin up to 2.13.2 and classified as critical. This issue affects the function Nbdesigner_IO::convert_url_to_path of the component nbu_crop_image AJAX handler. The manipulation of the argument url with an unknown input leads to a unrestricted upload vulnerability. Using CWE to declare the problem leads to CWE-434. The product allows the upload or transfer of dangerous file types that are automatically processed within its environment. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The Printcart Store – Web to Print Product Designer for WooCommerce plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.13.2. This is due to the `nbu_crop_image` AJAX handler accepting a user-supplied `url` parameter that `Nbdesigner_IO::convert_url_to_path()` concatenates onto the uploads base directory without normalizing or stripping `../` sequences, and then deriving both the output directory and output file extension via `pathinfo()` from the same attacker-controlled path — with no `stripImage()` call before `writeImage()` is invoked. This makes it possible for unauthenticated attackers to write attacker-controlled PHP content to arbitrary locations outside the uploads directory, resulting in remote code execution when the written file is subsequently requested. This vulnerability is only exploitable when the `nbdesigner_upload_popup_style` site option is set to `a` (Advanced Upload Popup), which causes the handler to be registered for unauthenticated requests; however, the required `save-design` nonce is printed on the fully public frontend `upload-design-file` page, making it trivially obtainable by any anonymous visitor once that configuration is active.

The advisory is shared at wordfence.com. The identification of this vulnerability is CVE-2026-19803 since 08/13/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/07/2026). MITRE ATT&CK project uses the attack technique T1608.002 for this issue.

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

• Printcart

Name

• Store Plugin

Version

• 2.13.0
• 2.13.1
• 2.13.2

CPE 2.3info

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CPE 2.2info

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