CB (legacy) <= 0.9.4.18 - Admin+ Stored XSS

2024-05-3100:00:00

Bob Matyas

stored xss vulnerability

admin interface

legacy version

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/admin.php?page=cb_timeframes_edit
2. Add a "timeframe" and for the field "Timeframe Title" enter the PoC: `"><script>alert(2)</script>
3. Save and see the XSS

Note: The XSS will trigger in other places throughout the admin interface where the timeframe is displayed.