Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/sticky/tags/2.5.6/includes/functions.
- https://plugins.trac.wordpress.org/browser/sticky/tags/2.5.6/includes/shortcode.
- https://plugins.trac.wordpress.org/browser/sticky/trunk/includes/functions.php#L
- https://plugins.trac.wordpress.org/browser/sticky/trunk/includes/shortcode.php#L
- https://www.wordfence.com/threat-intel/vulnerabilities/id/135783c5-8175-4775-a01
FAQ
What is CVE-2026-6397?
CVE-2026-6397 is a vulnerability with a CVSS score of 6.4 (MEDIUM). 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...
How severe is CVE-2026-6397?
CVE-2026-6397 has been rated MEDIUM with a CVSS base score of 6.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-6397?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.