CVE-2024-12427: Multi Step Form <= 1.7.23 - Missing Authorization to Unauthenticated Limited File Upload

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-01-16 · updated 2026-06-17
Weakness: CWE-862

Description

The Multi Step Form plugin for WordPress is vulnerable to unauthorized limited file upload due to a missing capability check on the fw_upload_file AJAX action in all versions up to, and including, 1.7.23. This makes it possible for unauthenticated attackers to upload limited file types such as images.

Affected products

Mondula GmbH Multi Step Form: before 1.7.24 — fixed in 1.7.24

How to fix

Upgrade to a fixed version: Mondula GmbH Multi Step Form 1.7.24. Check the vendor advisory for mitigations.

References

https://plugins.trac.wordpress.org/browser/multi-step-form/tags/1.7.22/includes/lib/msf-shortcode.class.php#L100
https://plugins.trac.wordpress.org/browser/multi-step-form/tags/1.7.22/includes/lib/msf-shortcode.class.php#L30
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3219723%40multi-step-form&new=3219723%40multi-step-form&sfp_email=&sfph_mail=
https://www.wordfence.com/threat-intel/vulnerabilities/id/f0a31fee-ccc2-4c3b-b198-6cb750188113?source=cve

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