PostX < 4.1.0 - Contributor+ Stored XSS

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

PoC

As a contributor, put the below code in a post while in Code Editor mode The XSS will be triggered when (pre)viewing the post and moving the mouse over the ClickMe! text