CVE-2025-11829: FIVE9 Live Chat

Medium severity, CVSS 6.4. EPSS: 0.2% chance of exploitation in the next 30 days.

The Five9 Live Chat plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'toolbar' attribute of the [five9-chat] shortcode in all versions up to, and including, 1.1.2. This is due 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

• FIVE9 FIVE9 Live Chat: up to and including 1.1.2

Published 2025-11-11. Last modified 2026-06-17.