WPForms Pro Plugin up to 1.10.1.1 on WordPress ajax_chunk_upload_finalize unrestricted upload

Summaryinfo

A vulnerability identified as critical has been detected in WPForms Pro Plugin up to 1.10.1.1. This issue affects the function ajax_chunk_upload_finalize. This manipulation causes unrestricted upload. This vulnerability is registered as CVE-2026-10818. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability has been found in WPForms Pro Plugin up to 1.10.1.1 and classified as critical. Affected by this vulnerability is the function ajax_chunk_upload_finalize. The manipulation with an unknown input leads to a unrestricted upload vulnerability. The CWE definition for the vulnerability is CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The WPForms Pro plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.10.1.1 via the ajax_chunk_upload_finalize function. This is due to the file type validation occurring after chunk metadata and file contents have already been written to disk, and the assembled file not being deleted upon validation failure. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.

It is possible to read the advisory at wordfence.com. This vulnerability is known as CVE-2026-10818 since 06/04/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. 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 07/25/2026). The attack technique deployed by this issue is T1608.002 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

• WPForms

Name

• Pro Plugin

Version

• 1.10.1.0
• 1.10.1.1

CPE 2.3info

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CPE 2.2info

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