CVE-2025-5336: Holithemes Click To Chat – Holithemes

Medium severity, CVSS 6.4. EPSS: 0.3% chance of exploitation in the next 30 days.

The Click to Chat plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘data-no_number’ parameter in all versions up to, and including, 4.22 to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

• Holithemes Click To Chat – Holithemes: up to and including 4.22

Published 2025-06-14. Last modified 2026-06-17.