What’s Vulnerable › Vulnerabilities

CVE-2026-6397: Sticky <= 2.5.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'readmoretext' Shortcode Attribute

• Severity: medium (CVSS 6.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-20 · updated 2026-07-24
• Weakness: CWE-79

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 products

• cvmh Sticky: through 2.5.6

References

• https://plugins.trac.wordpress.org/browser/sticky/tags/2.5.6/includes/functions.php#L118
• https://plugins.trac.wordpress.org/browser/sticky/tags/2.5.6/includes/shortcode.php#L7
• https://plugins.trac.wordpress.org/browser/sticky/trunk/includes/functions.php#L118
• https://plugins.trac.wordpress.org/browser/sticky/trunk/includes/shortcode.php#L7
• https://www.wordfence.com/threat-intel/vulnerabilities/id/135783c5-8175-4775-a013-f1e2bef04479?source=cve

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