EUVD-2026-13999
GHSA-43fr-2m4w-5h7x
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Lifecycle Timeline
3Description
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.
Analysis
The Ad Short WordPress plugin versions up to 2.0.1 contains a Stored Cross-Site Scripting (XSS) vulnerability in the 'ad' shortcode's 'client' attribute that allows authenticated attackers with Contributor-level access or higher to inject arbitrary JavaScript code into pages. The vulnerability results from insufficient input sanitization and output escaping in the ad_func() shortcode handler, which directly concatenates user-supplied input into HTML attributes without applying proper escaping functions like esc_attr(). …
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Remediation
Within 30 days: Identify affected systems running all and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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External POC / Exploit Code
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