What the vulnerability does
01Description
The HTML Forms – Simple WordPress Forms Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 1.5.5 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
Explanation of Vulnerability in Simple Terms
02Summary
The HTML Forms plugin for WordPress contains a stored cross-site scripting (XSS) vulnerability in versions up to 1.5.5. An attacker with high-level privileges can inject malicious scripts into form data that execute in the browsers of other users viewing the affected content. The vulnerability requires high attack complexity and affects the integrity and confidentiality of site data.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that run in other users' browsers when they view form data.
Potential impact on your site
04Site Impact
Administrators or high-privilege users could be compromised; malicious scripts could steal data or modify site content.
Conditions required to exploit
05Prerequisites
Attacker must have high-level WordPress privileges (administrator or equivalent); no user interaction required.
Key dates
06Disclosure timeline
November 8, 2025
CVE published
April 8, 2026
Record updated
