CVE-2023-4599: Wp-Webhooks Email Encoder

Medium severity, CVSS 5.4. EPSS: 0.5% chance of exploitation in the next 30 days.

The Email Encoder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'eeb_mailto' shortcode in versions up to, and including, 2.1.8 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. A partial patch was issued in version 2.1.8. The vulnerability was fully patched in 2.1.9.

Affected products

• Wp-Webhooks Email Encoder: up to and including 2.1.7

Published 2023-08-30. Last modified 2026-06-17.