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CVE-2026-5478

HIGH 8.1 CVSS 3.1
Published
April 20, 2026
Last modified
June 17, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-22
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

The Everest Forms plugin for WordPress is vulnerable to Arbitrary File Read and Deletion in all versions up to, and including, 3.4.4. This is due to the plugin trusting attacker-controlled old_files data from public form submissions as legitimate server-side upload state, and converting attacker-supplied URLs into local filesystem paths using regex-based string replacement without canonicalization or directory boundary enforcement. This makes it possible for unauthenticated attackers to read arbitrary local files (e.g., wp-config.php) by injecting path-traversal payloads into the old_files upload field parameter, which are then attached to notification emails. The same path resolution is also used in the post-email cleanup routine, which calls unlink() on the resolved path, resulting in the targeted file being deleted after being attached. This can lead to full site compromise through disclosure of database credentials and authentication salts from wp-config.php, and denial of service through deletion of critical files. Prerequisite: The form must contain a file-upload or image-upload field, and disable storing entry information.

Affected WordPress components

  • Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI Plugin · everest-forms
    Confirmed match Active
    Up to and including 3.4.4
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • wpeverest Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder — Up to and including 3.4.4

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/everest-forms/tags/3.4.4/includes/abstracts/class-evf-form-fields-upload.php#L1306
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/everest-forms/tags/3.4.4/includes/abstracts/class-evf-form-fields-upload.php#L1581
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/everest-forms/tags/3.4.4/includes/abstracts/class-evf-form-fields-upload.php#L1665
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset/3507814/everest-forms
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/8641eb53-6a9a-4549-b8ef-e37acbcc7f03?source=cve
  • nvd.nist.gov Official NVD record