What the vulnerability does
01Description
The Sentence To SEO (keywords, description and tags) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'Permanent keywords' field in all versions up to and including 1.0. This is due to insufficient input sanitization and output escaping. The plugin reads user input via filter_input_array(INPUT_POST) which applies no HTML sanitization (FILTER_DEFAULT), stores it unsanitized to the WordPress options table via update_option(), and then outputs the stored value directly into a textarea element without any escaping using PHP short echo tags (<?= ?>). An attacker can break out of the textarea element using a closing </textarea> tag and inject arbitrary HTML/JavaScript. This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses the plugin's settings page.
Explanation of Vulnerability in Simple Terms
02Summary
Sentence To SEO versions 1.0 and earlier contain a cross-site scripting vulnerability. An attacker with high privileges can inject malicious scripts that execute in other users' browsers, potentially compromising their sessions or stealing data. 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 execute in other users' browsers to steal session data or perform actions on their behalf.
Potential impact on your site
04Site Impact
A privileged user could inject scripts affecting other users' accounts and data; requires immediate access review and update.
Conditions required to exploit
05Prerequisites
Attacker must have high-level privileges (e.g., admin or editor role) on the site; no user interaction required.
Key dates
06Disclosure timeline
April 22, 2026
CVE published
April 22, 2026
Record updated
