CVE-2026-18325
Received Received - Intake

Stored XSS in Forminator WordPress Plugin via Forged Upload

Publication date: 2026-08-06

Last updated on: 2026-08-06

Assigner: Wordfence

Description
The Forminator Forms – Contact Form, Payment Form & Custom Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Forged Upload Record via Select Field in all versions up to, and including, 1.56.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The exploit is possible because Forminator_Core::sanitize_array() skips all filtering for keys prefixed with 'select-', and set_field_data() treats a submitted 'return' member as a trusted internal flag — allowing an unauthenticated attacker to forge and persist a complete upload field record with an arbitrary file_url value without any sanitization or validation.

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Meta Information

Published
2026-08-06
Last Modified
2026-08-06
Generated
2026-08-06
AI Q&A
2026-08-06
EPSS Evaluated
N/A
NVD
CVE-2026-18325
EUVD
EUVD-2026-53704

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wpforms forminator to 1.56.1 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) flaw in the Forminator Forms WordPress plugin. It allows unauthenticated attackers to inject malicious scripts into web pages by exploiting insufficient input sanitization and output escaping. The issue occurs because the plugin skips sanitization for keys prefixed with 'select-' and improperly handles a 'return' flag, enabling forged upload records with arbitrary file URLs.

Impact Analysis

Unauthenticated attackers can execute arbitrary web scripts on pages you visit, potentially stealing sensitive data like cookies or session tokens. This could lead to account takeovers, unauthorized actions on your behalf, or defacement of your WordPress site. The impact is significant due to the lack of authentication requirements for exploitation.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR's data protection requirements or HIPAA's safeguards for protected health information. Organizations may face fines, legal liabilities, and reputational damage if exploited. Compliance with these regulations requires preventing unauthorized script execution and data exfiltration.

Mitigation Strategies

Update the Forminator Forms plugin to the latest version beyond 1.56.1 immediately. Disable the plugin temporarily if an update is not immediately available. Review all form submissions and uploaded files for suspicious content or URLs. Implement additional input sanitization for form fields, particularly those prefixed with 'select-'.

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