Page Builder Gutenberg Blocks < 3.1.7 - Contributor+ Stored XSS

2024-03-1200:00:00

Dmitrii Ignatyev

page builder

gutenberg blocks

stored xss

contributor+

icon block

link url field

exploit

5.9 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

9.0%

JSON

Description The plugin does not validate and escape some of its block options before outputting them back in a page/post where the block is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks

Create/Edit a Post, add an "Icon" block and put the following payload in the "Link Settings > Link URL: " field: 123" onmouseover='alert(/XSS/)'

The XSS will be triggered when viewing/previewing the post and moving the mouse over the icon