# Elementor Website Builder <= 4.3.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via Inline Post CSS

- **ID:** WPSEC-2026-0902
- **Plugin:** Elementor Website Builder – more than just a page builder (`elementor`), https://wordpress.org/plugins/elementor/
- **Affected versions:** all versions before 4.3.5
- **Fixed in:** 4.3.5 (Update to 4.3.5 or later.)
- **Severity:** Medium 4.9 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin High, affected versions High (as of 2026-10-14)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/elementor
- **Fix released:** 2026-10-13
- **Published:** 2026-10-14
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0902/

## Description

The Elementor Website Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via post CSS in all versions up to, and including, 4.3.4 due to insufficient neutralization of '</style' sequences when generated post CSS is printed inline inside a style tag. This makes it possible for authenticated attackers, with contributor-level access and above who can edit posts with Elementor, to close the style tag and inject arbitrary web scripts that execute whenever a user accesses the affected page. Exploitation requires that post CSS be printed inline, such as when Internal CSS Embedding is used.

## References

- https://wpsec.com/vuln/WPSEC-2026-0902/
- https://plugins.svn.wordpress.org/elementor/tags/4.3.5/
- https://wordpress.org/plugins/elementor/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0902/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.