MF Gig Calendar <= 1.2.1 - Editor+ Stored XSS

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

PoC

1. Go to “MF Gig Calendar > Settings” 2. In the “Empty Calendar” field, add the payload: 3. Click “Save Changes” and see the XSS.