CVE-2021-42360: Starter Templates — Elementor, Gutenberg & Beaver Builder Templates <= 2.7.0 Authenticated Block Import to Stored XSS
First published: Wed Nov 17 2021(Updated: )
On sites that also had the Elementor plugin for WordPress installed, it was possible for users with the edit_posts capability, which includes Contributor-level users, to import blocks onto any page using the astra-page-elementor-batch-process AJAX action. An attacker could craft and host a block containing malicious JavaScript on a server they controlled, and then use it to overwrite any post or page by sending an AJAX request with the action set to astra-page-elementor-batch-process and the url parameter pointed to their remotely-hosted malicious block, as well as an id parameter containing the post or page to overwrite. Any post or page that had been built with Elementor, including published pages, could be overwritten by the imported block, and the malicious JavaScript in the imported block would then be executed in the browser of any visitors to that page.
Credit: security@wordfence.com security@wordfence.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| KadenceWP Starter Templates | <=2.7.0 |
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Reference Links
Frequently Asked Questions
What is CVE-2021-42360?
CVE-2021-42360 is a vulnerability that affects sites using the Elementor plugin for WordPress and allows users with the edit_posts capability to import blocks onto any page.
What is the severity of CVE-2021-42360?
CVE-2021-42360 has a severity value of 5.4, which is considered high.
How does CVE-2021-42360 affect Brainstormforce Starter Templates?
CVE-2021-42360 affects Brainstormforce Starter Templates versions up to and including 2.7.0.
How can an attacker exploit CVE-2021-42360?
An attacker can exploit CVE-2021-42360 by crafting and hosting a malicious block that can be imported onto any page using the astra-page-elementor-batch-process AJAX action.
Where can I find more information about CVE-2021-42360?
You can find more information about CVE-2021-42360 at the following link: [Wordfence Blog](https://www.wordfence.com/blog/2021/11/over-1-million-sites-impacted-by-vulnerability-in-starter-templates-plugin/)
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