SendPress Newsletters <= 1.23.11.6 - Admin+ Stored XSS via Settings

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. Click SendPress in the Admin menu (which is available on the left side) 2. Go to the Settings=>Advanced, In the Optional Settings of ‘Read More override’ paramete add the payload: "/>![](x) 3. Save and reload to see XSS.