# Zoho CRM Lead Magnet <= 1.8.2.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Site-Wide Post HTML Allowlist Modification

- **ID:** WPSEC-2026-0816
- **Plugin:** Zoho CRM Lead Magnet (`zoho-crm-forms`), https://wordpress.org/plugins/zoho-crm-forms/
- **Affected versions:** all versions before 1.8.2.4
- **Fixed in:** 1.8.2.4 (Update to 1.8.2.4 or later.)
- **Severity:** Medium 6.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-13)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/zoho-crm-forms
- **Fix released:** 2026-10-12
- **Published:** 2026-10-13
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0816/

## Description

The Zoho CRM Lead Magnet plugin for WordPress is vulnerable to Stored Cross-Site Scripting via post content in all versions up to, and including, 1.8.2.3. This is because the plugin changes the global $allowedposttags array on every page load, adding the script tag and event handler attributes such as onclick, onchange and onblur to the HTML allowlist that WordPress uses to filter content from users without the unfiltered_html capability. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

## References

- https://wpsec.com/vuln/WPSEC-2026-0816/
- https://plugins.svn.wordpress.org/zoho-crm-forms/tags/1.8.2.4/
- https://wordpress.org/plugins/zoho-crm-forms/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0816/

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.