CVE-2026-4088 Switch CTA Box <= 1.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode
Authenticated attackers with contributor access can inject arbitrary scripts via shortcode parameters, 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-2026-4088?
CVE-2026-4088 is a medium-severity cross-site scripting vulnerability in wpshouter Switch CTA Box, published on 22 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Switch CTA Box plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'wppw_cta_box' shortcode in all versions up to, and including, 1.1. This is due to insufficient input sanitization and output escaping on user-supplied post meta values including 'cta_box_button_link', 'cta_box_button_id', 'cta_box_button_text', and 'cta_box_description'. The shortcode reads post meta from a user-specified post ID and echoes these values directly into HTML output without any escaping functions (no esc_attr(), esc_url(), or esc_html()). 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-2026-4088?
How do I fix CVE-2026-4088?
No fix has been published for CVE-2026-4088 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-2026-4088 being exploited?
There is no known exploitation of CVE-2026-4088 in the wild and no public exploit code.
Sources
Also known as GHSA-6jwx-v327-2xh9.