Cross-Site Scripting in reCaptcha Plugin for WordPress by WebDesignBy
CVE-2026-4512

Currently unrated

Key Information:

Vendor

WordPress
Status
Recaptcha By Webdesignby
Vendor
CVE Published:
23 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4512?

The reCaptcha plugin developed by WebDesignBy for WordPress prior to version 2.0 is vulnerable to Cross-Site Scripting (XSS). The vulnerability arises from improper sanitization and escaping of the Site Key setting, which is outputted directly in a JavaScript context within the grecaptcha_js() function. This oversight allows administrators on multisite installations, lacking unfiltered_html capability, to introduce arbitrary JavaScript code. Consequently, any injected JavaScript can execute for all users accessing the WordPress login page, posing significant security risks to site visitors.

Affected Version(s)

reCaptcha by WebDesignBy 0 < 2.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-4512 - Proof of Concept

References

https://wpscan.com/vulnerability/6dfb4378-fe6a-4462-af10-...
exploitvdb-entrytechnical-description

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Mustafa Ahmed
WPScan
.