Super Forms <= 6.3.313 - Unauthenticated Arbitrary File Upload via 'data' Parameter (datauristring / value)
The Super Forms – Drag & Drop Form Builder plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 6.3.313 via the submit_form function. This is due to missing file type validation and the absence of any capability check on the submit_form nopriv AJAX handler, whose only barrier is a session nonce freely obtainable by unauthenticated visitors via a separate nopriv endpoint. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. The nonce requirement is trivially bypassed because the super_create_nonce nopriv AJAX action allows any unauthenticated visitor to mint a valid sf_nonce and session cookie in a single prior request, reducing exploitation to two unauthenticated HTTP requests.
Quick answer
Super Forms – Drag & Drop Form Builder should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- *-6.3.313
Fixed versions
- 6.3.314
How to fix it
Super Forms – Drag & Drop Form Builder is affected by CVE-2026-14894, a authorization bypass issue in versions up to 6.3.313. Wordfence lists the official remediation as updating to version 6.3.314, or a newer patched version. Prioritize internet-facing WordPress sites, sites with public registration, customer portals, and admin workflows where the vulnerable feature is enabled. If immediate patching is not possible, disable the affected plugin or vulnerable feature, restrict access, and monitor for exploitation until the update is installed.
- Inventory every WordPress site that has Super Forms – Drag & Drop Form Builder installed, including staging, multisite, client, and WooCommerce environments.
- Confirm the installed Super Forms – Drag & Drop Form Builder version and compare it with the affected range from the Wordfence advisory.
- Update Super Forms – Drag & Drop Form Builder to version 6.3.314, or to a newer vendor-supported patched version from the official WordPress update channel.
- If the update cannot be applied immediately, disable Super Forms – Drag & Drop Form Builder or the affected feature and restrict access with roles, authentication, WAF rules, or temporary route blocking.
- Review affected REST endpoints, AJAX actions, roles, capabilities, orders, appointments, account records, and payment or status changes for unauthorized activity.
- Rotate administrator sessions, API keys, webhook secrets, and integration tokens if logs or content review suggest compromise.
- Clear WordPress, object, CDN, page-builder, and browser caches after patching so vulnerable assets or stored payloads are not served.
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Verify the fix
- Confirm the running Super Forms – Drag & Drop Form Builder version is version 6.3.314 or newer, and record the patched version in the remediation ticket.
- Verify unauthenticated or low-privilege users can no longer trigger the affected action, endpoint, payment, appointment, account, or settings change.
- Review web server, WordPress, security plugin, WAF, and application logs for exploitation attempts before and after the fix.
- Retest normal user, admin, checkout, form, API, or integration workflows to confirm the update did not break expected behavior.
- Run a fresh Fixnx scan and document the public exposure state, patched version, log review, and any cleanup evidence.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-14894?
Super Forms – Drag & Drop Form Builder versions listed as affected should be reviewed: *-6.3.313.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.