Everest Forms upload values permit unauthenticated SSRF

Everest Forms through 3.4.4 accepts an arbitrary upload-field URL from POST data in load_previous_field_value(). When another required field is left empty and the form rerenders, get_local_file_size() passes that URL to wp_remote_head(), allowing an unauthenticated attacker to make the WordPress server send HTTP HEAD requests to arbitrary destinations.

CVE / CNA score 5.3 CVSS 3.1 · security@wordfence.com

NVD score Pending NVD has not published its own CVSS assessment.

Component: Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI
Plugin slug: everest-forms
Affected: <= 3.4.4
Safe version: See mitigation notes
Published: Aug 28, 2026
Weakness: CWE-918 — Server-Side Request Forgery (SSRF)

This CVE was published Aug 28, 2026 and is one of 24 known issues for this plugin.

What to do

Update, patch or deactivate.

No fixed release is confirmed. Update Everest Forms when a release after 3.4.4 is confirmed to fix the issue; until then, disable public forms with upload fields when warranted and review outbound HTTP and form-submission logs.

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.

Source record

Technical description

The Everest Forms plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 3.4.4. This is due to the `load_previous_field_value()` method in `class-evf-form-task.php` accepting arbitrary URL values from `$_POST` data for upload fields without domain restriction, which are then passed to `wp_remote_head()` in the `get_local_file_size()` method of `class-evf-form-fields-upload.php`. This makes it possible for unauthenticated attackers to force the WordPress server to make outbound HTTP HEAD requests to arbitrary URLs by submitting a form with an upload field containing a malicious URL while leaving a required field empty to trigger form re-rendering.

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

Primary and upstream sources

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