Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Brainstormforce | Starter Templates | <= 2.7.0 |
Related Weaknesses (CWE)
References
- https://www.wordfence.com/blog/2021/11/over-1-million-sites-impacted-by-vulnerabExploitThird Party Advisory
- https://www.wordfence.com/blog/2021/11/over-1-million-sites-impacted-by-vulnerabExploitThird Party Advisory
FAQ
What is CVE-2021-42360?
CVE-2021-42360 is a vulnerability with a CVSS score of 7.6 (HIGH). 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 us...
How severe is CVE-2021-42360?
CVE-2021-42360 has been rated HIGH with a CVSS base score of 7.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-42360?
Check the references section above for vendor advisories and patch information. Affected products include: Brainstormforce Starter Templates.