Ultra Addons for Contact Form 7 Plugin up to 3.5.50 on WordPress File Upload unrestricted upload

Summaryinfo

A vulnerability was found in Ultra Addons for Contact Form 7 Plugin up to 3.5.50. It has been declared as critical. The impacted element is an unknown function of the component File Upload Handler. Executing a manipulation can lead to unrestricted upload. The identification of this vulnerability is CVE-2026-84750. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Ultra Addons for Contact Form 7 Plugin up to 3.5.50. This vulnerability affects some unknown processing of the component File Upload Handler. 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. CVE summarizes:

The Ultra Addons for Contact Form 7 WordPress plugin before 3.5.51 does not validate the type or extension of files uploaded through one of its form fields, and stores them at a predictable public path with the attacker-chosen extension intact, allowing unauthenticated users to upload arbitrary files. The PHP handler shipped by default with the Debian and Ubuntu Apache packages maps .phar to PHP alongside .php and .phtml, so on that stack the uploaded file is executed and the issue leads to Remote Code Execution and full site takeover. Where the host routes only .php to the PHP handler, the same file is instead served from the site's own origin with its script intact, leading to Stored Cross-Site Scripting.

The advisory is available at wpscan.com. This vulnerability was named CVE-2026-84750 since 09/02/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1608.002 by the MITRE ATT&CK project.

Upgrading to version 3.5.51 eliminates this vulnerability.

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Productinfo

Type

• WordPress Plugin

Name

• Ultra Addons for Contact Form 7 Plugin

Version

• 3.5.0
• 3.5.1
• 3.5.2
• 3.5.3
• 3.5.4
• 3.5.5
• 3.5.6
• 3.5.7
• 3.5.8
• 3.5.9
• 3.5.10
• 3.5.11
• 3.5.12
• 3.5.13
• 3.5.14
• 3.5.15
• 3.5.16
• 3.5.17
• 3.5.18
• 3.5.19
• 3.5.20
• 3.5.21
• 3.5.22
• 3.5.23
• 3.5.24
• 3.5.25
• 3.5.26
• 3.5.27
• 3.5.28
• 3.5.29
• 3.5.30
• 3.5.31
• 3.5.32
• 3.5.33
• 3.5.34
• 3.5.35
• 3.5.36
• 3.5.37
• 3.5.38
• 3.5.39
• 3.5.40
• 3.5.41
• 3.5.42
• 3.5.43
• 3.5.44
• 3.5.45
• 3.5.46
• 3.5.47
• 3.5.48
• 3.5.49
• 3.5.50

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