CVE-2026-6397Sticky <= 2.5.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'readmoretext' Shortcode Attribute
Updated under an hour ago ()
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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
- 6.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- Weakness (CWE)
- CWE-79
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Wordfence
- NVD analysis
- Deferred
- Record last updated
- May 20, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
cvmh Sticky cvmh:sticky (from the name) | through 2.5.6 | CNA record |
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/135783c5-8175-4775-a013-f1e2bef04479?source=cve
- https://plugins.trac.wordpress.org/browser/sticky/trunk/includes/functions.php#L118
- https://plugins.trac.wordpress.org/browser/sticky/tags/2.5.6/includes/functions.php#L118
- https://plugins.trac.wordpress.org/browser/sticky/trunk/includes/shortcode.php#L7
- https://plugins.trac.wordpress.org/browser/sticky/tags/2.5.6/includes/shortcode.php#L7
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.