SigmaForms Pro unrestricted form uploads permit unauthenticated code execution
SigmaForms Pro through 1.4.5 grants unfiltered_upload during handle_form_submission() and bypasses MIME validation when allowed_file_types is not configured. An unauthenticated visitor can upload executable content and run code on the server. Default Job Application, Support Ticket, and Wholesale Application templates include unrestricted upload fields, making the path available on a default installation using those templates.
- Component
- SigmaForms Pro – AI Generated Forms
- Plugin slug
sigmaforms-pro- Affected
- <= 1.4.5
- Safe version
- See mitigation notes
- Published
- Aug 29, 2026
This CVE was published Aug 29, 2026 and is one of 3 known issues for this plugin.
Update, patch or deactivate.
No fixed release is identified. Disable and remove SigmaForms Pro until a confirmed fix is available, inspect uploaded files and form submissions, and rotate site and hosting credentials if exploitation is suspected.
No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The Sigma Forms Pro plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1.4.5 via the handle_form_submission function. This is due to the plugin dynamically granting the unfiltered_upload capability to all users during form submissions and bypassing MIME type validation when allowed_file_types is not configured. This makes it possible for unauthenticated attackers to execute code on the server. Several default pre-built templates including Job Application, Support Ticket, and Wholesale Application have file upload fields with no file type restrictions configured by design, making this vulnerability immediately exploitable upon installation.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H