What the vulnerability does
01Description
The KIA Subtitle plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's `the-subtitle` shortcode `before` and `after` attributes in all versions up to, and including, 4.0.1. This is due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Explanation of Vulnerability in Simple Terms
02Summary
KIA Subtitle versions 4.0.1 and earlier contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts. The vulnerability has scope change, meaning injected code can affect other users or site functionality beyond the vulnerable component. An attacker with low-level site access can craft malicious input that executes in other users' browsers when they view affected content.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers and affect site functionality.
Potential impact on your site
04Site Impact
Authenticated users with low privileges can inject code affecting other users and site operations.
Conditions required to exploit
05Prerequisites
Attacker must have low-level authenticated access to the site; no user interaction required.
Key dates
06Disclosure timeline
May 22, 2026
CVE published
May 22, 2026
Record updated
