Paytium <= 4.3.6 is vulnerable to Auth. Stored Cross-Site Scripting (XSS) vulnerability

The Paytium plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'paytium_live_api_key' option and 'newsletter_group' attribute in versions up to, and including, 4.3.6 due to insufficient input sanitization and output escaping. This makes it possible for administrator-level attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.