Chart.js for WordPress <= 2023.2 - Editor+ Stored Cross-Site Scripting in New Chart

Description The plugin does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).

PoC

1. Go to Charts > New Chart > HTML 3. Insert the following payload: "-alert("asifensergen-waren-hier “)-” 5. Click on Save. 6. You can see the stored XSS on: https://example.com/charts/chartjs