TNC Toolbox: Web Performance <= 1.4.2 — Unauthenticated Sensitive Information Exposure to Privilege Escalation/cPanel Account Takeover

Am I affected?

• Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under TNC Toolbox: Web Performance.
• 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 2.0.0, or a newer patched version
2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
3. Watch TNC Toolbox: Web Performance to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to kr0d.

The TNC Toolbox: Web Performance plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 1.4.2. This is due to the plugin storing cPanel API credentials (hostname, username, and API key) in files within the web-accessible wp-content directory without adequate protection in the "Tnc_Wp_Toolbox_Settings::save_settings" function. This makes it possible for unauthenticated attackers to retrieve these credentials and use them to interact with the cPanel API, which can lead to arbitrary file uploads, remote code execution, and full compromise of the hosting environment.

Exploits & references

Proof-of-concept & detection

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

Advisories & patches

• Advisorywordfence.com

Related CVEs

Timeline

1. Nov 10, 2025

   CVE published

   Severity critical, CVSS 10.0

2. Nov 13, 2026

   Record last updated