GamiPress <= 7.9.9.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'heading_size' Shortcode Attribute

Summary

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.

Timeline

1. Jul 28, 2026, 6:54 AM UTCCVE published
2. Jul 28, 2026, 1:30 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Jul 28, 2026, 1:30 PM UTCRecord last updated

Affected versions

• rubengc GamiPress – Gamification plugin to reward points, achievements, badges & ranks in WordPress

  through 7.9.9.1

References 7