Simple Post <= 1.1 - Authenticated Stored Cross-Site Scripting (XSS)

2021-07-2300:00:00

Vikas Srivastava

330

wordpress installation

simple post activation

settings configuration

xss payload

database storage

javascript execution

exploit

EPSS

Percentile

14.0%

JSON

The plugin does not sanitize user input when an authenticated user Text value, then it does not escape these values when outputting to the browser leading to an Authenticated Stored XSS Cross-Site Scripting issue.

1. Install WordPress 5.7.2
2. Install and activate Simple Post
3. Navigate to Settings >> Simple Post and enter the XSS payload into the Text input field.
4. Click Update Options.
5. You will observe that the payload successfully got stored into the database and when you are triggering the same functionality at that time JavaScript payload is executing successfully and we are getting a pop-up.
6. Payload Used: "><script>alert(document.cookie)</script>

References

vulners.com/exploitdb/EDB-ID:50150

EPSS

Percentile

14.0%

JSON

Related for WPEX-ID:A3CD3115-2181-4E14-8B39-4DE096433847