Vulnerability Description
The Ad Short plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'ad' shortcode's 'client' attribute in all versions up to and including 2.0.1. This is due to insufficient input sanitization and output escaping on the 'client' shortcode attribute. The ad_func() shortcode handler at line 71 accepts a 'client' attribute via shortcode_atts() and directly concatenates it into a double-quoted HTML attribute (data-ad-client) at line 130 without applying esc_attr() or any other sanitization. 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 an injected page.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/ad-short/tags/2.0.1/ad_short.php#L130
- https://plugins.trac.wordpress.org/browser/ad-short/tags/2.0.1/ad_short.php#L77
- https://plugins.trac.wordpress.org/browser/ad-short/trunk/ad_short.php#L130
- https://plugins.trac.wordpress.org/browser/ad-short/trunk/ad_short.php#L77
- https://www.wordfence.com/threat-intel/vulnerabilities/id/313d2749-7662-4870-b0f
FAQ
What is CVE-2026-4067?
CVE-2026-4067 is a vulnerability with a CVSS score of 6.4 (MEDIUM). The Ad Short plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'ad' shortcode's 'client' attribute in all versions up to and including 2.0.1. This is due to insufficient input ...
How severe is CVE-2026-4067?
CVE-2026-4067 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-2026-4067?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.