CVE-2026-84750 Ultimate Addons for Contact Form 7 3.2.4 - 3.5.50 - Unauthenticated Arbitrary File Upload via Signature Field
Unauthenticated attackers can upload arbitrary files to the WordPress plugin, leading to remote code execution or stored XSS depending on server configuration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84750?
CVE-2026-84750 is a medium-severity vulnerability in Unknown Ultra Addons for Contact Form 7, published on 19 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-434
Which versions are affected by CVE-2026-84750?
How do I fix CVE-2026-84750?
No fix has been published for CVE-2026-84750 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-84750 being exploited?
There is no known exploitation of CVE-2026-84750 in the wild and no public exploit code.
Sources
Also known as GHSA-cq73-82v9-gx86.