CVE-2023-6133

Forminator <= 1.27.0 - Authenticated (Administrator+) Arbitrary File Upload

2023-11-14 00:00

Strategic Overview

Status: Patched in 1.28.0
Affected Plugin: Forminator Forms – Contact Form, Payment Form & Custom Form Builder
Affected Version: <= 1.27.0
CVSS: 6.6Medium
Weakness type: CWE-434 · Unrestricted Upload of File with Dangerous Type
CVE: CVE-2023-6133

View all Forminator Forms – Contact Form, Payment Form & Custom Form Builder vulnerabilities

At a glance

CVE-2023-6133 is a medium-severity Unrestricted Upload of File with Dangerous Type vulnerability in the Forminator Forms WordPress plugin, affecting versions <= 1.27.0. It carries a CVSS score of 6.6 (reachable over the network; high confidentiality, integrity, availability impact). Exploitation requires an authenticated account at Administrator level or above. The issue is fixed in version 1.28.0; sites on affected versions should update now. Disclosed November 2023, reported by István Márton.

Vulnerability Overview

The Forminator plugin for WordPress is vulnerable to arbitrary file uploads due to insufficient blacklisting on the 'forminator_allowed_mime_types' function in versions up to, and including, 1.27.0. This makes it possible for authenticated attackers with administrator-level capabilities or above to upload arbitrary files on the affected site's server, but due to the htaccess configuration, remote code cannot be executed.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-434: Unrestricted Upload of File with Dangerous Type

Forminator Forms <= 1.27.0 carries this weakness at forminator_allowed_mime_types, and reaching it takes an account at Administrator level or above. An unrestricted file upload lets a caller store a file whose type or destination the application does not properly constrain.

If an uploaded file lands anywhere the server will execute, the flaw becomes remote code execution and the site should be treated as fully compromised. For Forminator Forms the fix is 1.28.0: builds <= 1.27.0 are affected, anything from 1.28.0 onward is not.

Remediation

Update to version 1.28.0, or a newer patched version

How does WordSec protect against this?

An attacker needs Administrator access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: Forminator Forms 1.28.0 closes this, and updating the plugin is the step that ends it.

Firewall
Scanner
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2023-6133 https://www.wordfence.com/threat-intel/vulnerabilities/id/13cfa202-ab90-46c0-ab53-00995bfdcaa3 https://nvd.nist.gov/vuln/detail/CVE-2023-6133

Related records

Same weakness class

Other vulnerabilities in Forminator Forms – Contact Form, Payment Form & Custom Form Builder

CVSS Vector

6.6

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

Base

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredHigh
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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