Sticky, CVE-2026-6397

CVE, Research URL: CVE-2026-6397
Home page URL: Security reports for Sticky
Application: Sticky
Published on: May 20, 2026
Research Description: 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 versions: max 2.5.6.
Status: vulnerable