Simple Post <= 1.1 – Authenticated Stored Cross-Site Scripting (XSS) | CVE 2021-24567 | Plugin Vulnerabilities

Description

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.

Proof of Concept

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>

Affects Plugins

No known fix

References

CVE

Exploitdb

Classification

Type

XSS

OWASP top 10

A7: Cross-Site Scripting (XSS)

CWE

CVSS

Miscellaneous

Original Researcher

Vikas Srivastava

Submitter

Vikas Srivastava

Submitter website

https://www.linkedin.com/in/007vikaxh

Submitter twitter

Verified

No

WPVDB ID

a3cd3115-2181-4e14-8b39-4de096433847

Timeline

Publicly Published

2021-07-23 (about 4 years ago)

Added

2021-07-23 (about 4 years ago)

Last Updated

2021-08-10 (about 4 years ago)

Other

Published

Title

Published

2022-10-28

Title

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Published

2023-09-22

Title

WP Mailto Links – Protect Email Addresses < 3.1.4 - Contributor+ Stored XSS

Published

2025-02-17

Title

WP-BibTeX <= 3.0.1 - Authenticated (Contributor+) Stored Cross-Site Scripting

Published

2024-03-01

Title

Calculated Fields Form Professional < 5.1.57 - Unauthenticated Stored Cross-Site Scripting

Published

2018-04-03

Title

WordPress 3.7-4.9.4 - Escape Version in Generator Tag