Login with WHMCS <= 1.11.3 — Authentication Bypass

Am I affected?

• Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Login with WHMCS.
• No admin access? Run a passive check of your site. It reads public files only.
• No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

1. Update to version 1.11.4, or a newer patched version
2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
3. Watch Login with WHMCS to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence.

The Login with WHMCS plugin for WordPress is vulnerable to authentication bypass in versions up to, and including 1.11.3. This is due to the plugin accepting a user supplied email address that is passed to wp_set_auth_cookie() with no further identity validation to verify that the email supplied belongs to the user trying to log in with that email address. This makes it possible for unauthenticated attackers to log in as a site administrator granted they have access to a site admin's email address.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

• Advisorywordfence.com

Timeline

1. Jun 23, 2022

   CVE published

   Severity critical, CVSS 9.8

2. Nov 13, 2026

   Record last updated