CSSable Countdown <= 1.5 - Admin+ Stored XSS

2024-05-3100:00:00

Bob Matyas

stored xss

cssable countdown

admin+

event description

frontend

payload

5.6 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

9.1%

JSON

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)

1. Go to https://example.com/wp-admin/widgets.php
2. Add the "CSSable Countdown" widget
3. Under "Add Text" add the payload `</script><script>alert(1)</script>` to the "Event Description"
4. View the frontend and see the XSS