CVE-2026-6397: Cvmh Sticky

Medium severity, CVSS 6.4. EPSS: 0.3% chance of exploitation in the next 30 days.

The Sticky plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `cvmh-sticky` shortcode `readmoretext` attribute in versions up to and including 2.5.6. This is due to insufficient input sanitization and output escaping in the `cvmh_sticky_front_render()` function — the `readmoretext` attribute value is passed through `apply_filters()` and directly concatenated into the HTML output without any escaping function such as `esc_html()`. 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 a page containing the injected shortcode.

Affected products

• Cvmh Sticky: up to and including 2.5.6

Published 2026-05-20. Last modified 2026-07-24.