CVE-2026-4067 Ad Short <= 2.0.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'client' Shortcode Attribute
Authenticated attackers can inject arbitrary scripts via the client shortcode attribute, leading to stored XSS execution on victim pages.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4067?
CVE-2026-4067 is a medium-severity cross-site scripting vulnerability in nocaredev Ad Short, published on 21 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-4067?
How do I fix CVE-2026-4067?
No fix has been published for CVE-2026-4067 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-4067 being exploited?
There is no known exploitation of CVE-2026-4067 in the wild and no public exploit code.
Sources
Also known as GHSA-43fr-2m4w-5h7x.