What’s Vulnerable › Vulnerabilities

CVE-2026-2374: Login No Captcha reCAPTCHA <= 1.8.0 - Unauthenticated Stored Cross-Site Scripting via PHP_SELF

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-28 · updated 2026-06-17
• Weakness: CWE-79

Description

The Login No Captcha reCAPTCHA plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `$_SERVER['PHP_SELF']` superglobal in all versions up to, and including, 1.8.0. This is due to the `authenticate()` function storing the unsanitized output of `basename($_SERVER['PHP_SELF'])` in the `login_nocaptcha_error` WordPress option when a login attempt is made from a non-standard login page (e.g., xmlrpc.php). The `admin_notices()` function then echoes this stored value directly into the admin dashboard HTML without escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute when an administrator with a whitelisted IP address visits the WordPress dashboard within 30 seconds of the attack.

Affected products

• robertpeake Login No Captcha reCAPTCHA: through 1.8.0

References

• https://plugins.trac.wordpress.org/browser/login-recaptcha/tags/1.7.3/login-nocaptcha.php#L281
• https://plugins.trac.wordpress.org/browser/login-recaptcha/tags/1.7.3/login-nocaptcha.php#L377
• https://plugins.trac.wordpress.org/browser/login-recaptcha/trunk/login-nocaptcha.php#L281
• https://plugins.trac.wordpress.org/browser/login-recaptcha/trunk/login-nocaptcha.php#L377
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3549342%40login-recaptcha&new=3549342%40login-recaptcha&sfp_email=&sfph_mail=
• https://wordpress.org/plugins/login-recaptcha/
• https://www.wordfence.com/threat-intel/vulnerabilities/id/99dfce3b-2b47-41bf-8b20-b53fb9f061a7?source=cve

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