# Forminator Forms <= 1.57.3 - Unauthenticated Arbitrary Shortcode Execution via User-Agent Header and Referer URL

- **ID:** WPSEC-2026-0618
- **Plugin:** Forminator Forms – Contact Form, Payment Form & Custom Form Builder (`forminator`), https://wordpress.org/plugins/forminator/
- **Affected versions:** all versions before 1.57.3.1
- **Fixed in:** 1.57.3.1 (Update to 1.57.3.1 or later.)
- **Severity:** Medium 5.6 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L)
- **Weakness:** CWE-94
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-10-08)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/forminator
- **Fix released:** 2026-10-07
- **Published:** 2026-10-08
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0618/

## Description

The Forminator Forms plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in all versions up to, and including, 1.57.3. When a quiz notification email contained the {quiz_result} tag, the plugin replaced request-controlled tags such as {user_agent}, {refer_url} and {http_refer} and then ran do_shortcode() on the whole message without removing shortcode syntax from those values. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes when completing a quiz whose notification uses these tags.

## References

- https://wpsec.com/vuln/WPSEC-2026-0618/
- https://plugins.svn.wordpress.org/forminator/tags/1.57.3.1/
- https://wordpress.org/plugins/forminator/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0618/

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.