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Prasad BorvankarWPEX-ID:9FD2EB81-185D-4D42-8ACF-925664B7CB2F

HistoryOct 09, 2023 - 12:00 a.m.

Popup box < 3.7.2 - Admin+ Stored Cross-Site Scripting

2023-10-0900:00:00

Prasad Borvankar

popup box

admin

stored

cross-site scripting

custom content

payload

text mode

xss

editing

frontend

exploit

5.1 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

14.0%

JSON

Description The plugin does not sanitize and escape some Popup fields, which could allow high-privilege users such as an administrator to inject arbitrary web scripts even when the unfiltered_html capability is disallowed (for example in a multisite setup).

1. Create a new PopUp Box within the plugin.
2. In the "Custom Content" and Popup Description fields, enter the following payload when in text mode: <img src onerror=alert(/XSS/)>
3. The XSS will be triggered when editing the Popup up again, or when accessing the frontend (such as the homepage)