Description

CraftCMS stored XSS in Quick Post widget error message

Summary

The platform does not filter input and encode output in Quick Post validation error message, which can deliver an XSS payload.

Details

Old CVE fixed the XSS in label HTML but didn’t fix it when clicking save.

PoC

Login at admin

Go to setting

Create a Section

On Entry page, click Edit label

Inject the XSS payload into the label and save

On the admin dashboard choose new widget -> Quick Post

In Quick Post, click save with blank slug; The XSS will be executed

"errors":{"title":[" cannot be blank."],"slug":["Slug cannot be blank."]

Fixed in https://github.com/craftcms/cms/commit/9d0cd0bda7c8a830a3373f8c0f06943e519ac888

Mitigation

Aliases

References