CVE-2026-4005 Cross-site scripting in Coachific Shortcode
Authenticated attackers can inject arbitrary web scripts via the userhash 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-2026-4005?
CVE-2026-4005 is a medium-severity cross-site scripting vulnerability in Coachific Shortcode, published on 15 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Coachific Shortcode plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'userhash' shortcode attribute in all versions up to and including 1.0. This is due to insufficient input sanitization and output escaping. The plugin uses sanitize_text_field() on the 'userhash' parameter, which strips HTML tags but does not escape characters significant in a JavaScript string context (such as double quotes, semicolons, and parentheses). The sanitized value is then directly interpolated into a JavaScript string within a <script> tag on line 29 without any JavaScript-specific escaping (e.g., wp_json_encode() or esc_js()). 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-2026-4005?
How do I fix CVE-2026-4005?
No fix has been published for CVE-2026-4005 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-2026-4005 being exploited?
There is no known exploitation of CVE-2026-4005 in the wild and no public exploit code.
Sources
Also known as GHSA-953c-p36c-7pc3.