CVE-2024-12427

Multi Step Form <= 1.7.23 - Missing Authorization to Unauthenticated Limited File Upload

2025-01-15 21:22

Strategic Overview

Status: Patched in 1.7.24
Affected Plugin: Multi Step Form
Affected Version: <= 1.7.23
CVSS: 5.3Medium
Weakness type: CWE-862 · Missing Authorization
CVE: CVE-2024-12427

View all Multi Step Form vulnerabilities

At a glance

CVE-2024-12427 is a medium-severity Missing Authorization vulnerability in the Multi Step Form WordPress plugin, affecting versions <= 1.7.23. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.7.24; sites on affected versions should update now. Disclosed January 2025, reported by Ryan Zegar.

Vulnerability Overview

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.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-862: Missing Authorization

Reaching this weakness in Multi Step Form <= 1.7.23 takes no account at all. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.

Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Multi Step Form the fix is 1.7.24: builds <= 1.7.23 are affected, anything from 1.7.24 onward is not.

Remediation

Update to version 1.7.24, or a newer patched version

How does WordSec protect against this?

This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: Multi Step Form 1.7.24 closes this, and updating the plugin is the step that ends it.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2024-12427 https://www.wordfence.com/threat-intel/vulnerabilities/id/f0a31fee-ccc2-4c3b-b198-6cb750188113 https://nvd.nist.gov/vuln/detail/CVE-2024-12427

Related records

Same weakness class

5.3CVE-2024-50428: Multi Step Form <= 1.7.21 Missing AuthorizationCVE-2024-50428

Other vulnerabilities in Multi Step Form

CVSS Vector

5.3

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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