What’s Vulnerable › Vulnerabilities

CVE-2026-4067: Ad Short <= 2.0.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'client' 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: 2026-03-21 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• nocaredev Ad Short: through 2.0.1

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-b0f7-19253797f833?source=cve

Get alerted when CVE-2026-4067 or the next vulnerability affects your stack