CVE-2026-8844 Responsive Check <= 0.0.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes
Authenticated attackers can inject arbitrary scripts via shortcode attributes, leading to stored XSS execution for other users.
- 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-2026-8844?
CVE-2026-8844 is a medium-severity cross-site scripting vulnerability in kevin1804 Responsive Check, published on 27 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Responsive Check plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'rspcheck' shortcode in versions up to, and including, 0.0.3. This is due to insufficient input sanitization and output escaping on the 'url' (and 'button') shortcode attributes in the rspc_check_shortcode() function, which are echoed directly into iframe src attributes without esc_attr() or esc_url(). 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-2026-8844?
How do I fix CVE-2026-8844?
No fix has been published for CVE-2026-8844 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-2026-8844 being exploited?
There is no known exploitation of CVE-2026-8844 in the wild and no public exploit code.
Sources
Also known as GHSA-ww88-w7jc-gf24.