Validation Bypass via Plugin Verification vulnerability found by Sucuri in WordPress 123ContactForm plugin (versions <= 1.5.6).
2021-01-20 - we were unable to find a patched version of this plugin.
Notification from WordPress plugin repository: "This plugin has been closed as of October 27, 2020 and is not available for download. Reason: Security Issue."
Type Bypass Vulnerability OWASP Top 10 A2: Broken Authentication and Session Management