CVE-2026-4512 WP reCaptcha by WebDesignBy < 2.0 – Admin+ Stored XSS
Administrators on multisite installations can inject arbitrary JavaScript into the login page via the Site Key setting, affecting all visitors.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-4512?
CVE-2026-4512 is a low-severity cross-site scripting vulnerability in Unknown reCaptcha by WebDesignBy, published on 23 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
The reCaptcha by WebDesignBy WordPress plugin before 2.0 does not sanitize or escape the Site Key setting before outputting it in a JavaScript string context via the grecaptcha_js() function. This allows administrators on multisite installations (who do not have the unfiltered_html capability) to inject arbitrary JavaScript that executes for all visitors to the WordPress login page.
Weakness: CWE-79
Which versions are affected by CVE-2026-4512?
How do I fix CVE-2026-4512?
No fix has been published for CVE-2026-4512 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-2026-4512 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4512 exists.
Sources
Also known as GHSA-gq9g-w427-pc6x.