What the vulnerability does
01Description
The GamiPress – Gamification plugin to reward points, achievements, badges & ranks in WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'heading_size' Shortcode Attribute in all versions up to, and including, 7.9.9.1 due to insufficient input sanitization and output escaping. 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. The wp_kses_post filter applied at post save does not neutralize this payload because only the inert shortcode text is stored in post_content; the dangerous HTML is synthesized at render time by the shortcode handler, entirely bypassing save-time sanitization.
Explanation of Vulnerability in Simple Terms
02Summary
GamiPress versions up to 7.9.9.1 contain a cross-site scripting vulnerability that allows authenticated users to inject malicious scripts. The vulnerability has a changed scope, meaning injected code can affect other users and site functionality. An attacker with low-level WordPress access can craft malicious input that executes in other users' browsers, potentially compromising accounts or stealing data.
What an attacker can do
03Attacker Capabilities
Inject JavaScript that runs in other users' browsers to steal credentials, modify site content, or perform actions on their behalf.
Potential impact on your site
04Site Impact
Authenticated attackers can compromise other users' sessions and data. Site admins should restrict plugin access and update immediately.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege WordPress account (subscriber or contributor level). No user interaction required.
Key dates
06Disclosure timeline
July 28, 2026
CVE published
