What is CVE-2025-12539?

CVE-2025-12539 is a critical-severity vulnerability in Leopardhost Tnc Toolbox: Web Performance, classified under CWE-922. CVSS score: 10.0/10. Published 2025-11-11.

How severe is CVE-2025-12539?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Is CVE-2025-12539 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Leopardhost Tnc Toolbox: Web Performance

CVE-2025-12539

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.

EPSS: 0.010 (60.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Leopardhost Tnc Toolbox: Web Performance — versions 0

Weakness classification (CWE)

CWE-922

Public proof-of-concept exploits

Nxploited/CVE-2025-12539

References

Frequently asked questions

What is CVE-2025-12539?: CVE-2025-12539 is a critical-severity vulnerability in Leopardhost Tnc Toolbox: Web Performance, classified under CWE-922. CVSS score: 10.0/10. Published 2025-11-11.
How severe is CVE-2025-12539?: Critical severity. CVSS v3 base score is 10.0 out of 10.
Is CVE-2025-12539 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.