CVE-2026-6397
MediumCVSS 6.4Exploitation Probability (EPSS)
Low risk16th percentile - higher than 16% of all known CVEs
Summary
Stored XSS vulnerability in the 'cvmh-sticky' shortcode of the Sticky plugin for WordPress via the 'readmoretext' attribute allows authenticated attackers (Contributor-level and above) to inject arbitrary web scripts.
Risk Assessment
Risk of malicious script execution in visitors' browsers, potentially leading to session theft or defacement.
Recommendation
Update the Sticky plugin to version 2.5.7 or later.
Original NVD description (English source)
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.