---
id: CVE-2026-101335
title: >-
  Forminator Forms <= 1.58.1 - Unauthenticated Arbitrary Shortcode Execution via
  'User-Agent' Header and 'referer_url' Parameter via Quiz Notification Merge
  Tags
summary: >-
  The Forminator Forms – Contact Form, Payment Form & Custom Form Builder plugin
  for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up
  to, and including, 1.58.1. This is due to the
  forminator_replace_quiz_form_data() …
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-94
vendor: wpmudev
product: 'Forminator Forms – Contact Form, Payment Form & Custom Form Builder'
affected:
  - forminator_forms_contact_form_payment_form_custom_form_builder <= 1.58.1
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T14:51:26.987078Z'
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:09:40.456Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-101335'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/27640d44-1474-416a-8efd-e9524f9d3c7f?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/forminator/tags/1.57.3/library/helpers/helper-fields.php#L2965
  - url: >-
      https://plugins.trac.wordpress.org/browser/forminator/tags/1.57.3/library/helpers/helper-fields.php#L1652
  - url: >-
      https://plugins.trac.wordpress.org/browser/forminator/tags/1.57.3/library/helpers/helper-fields.php#L1476
  - url: >-
      https://plugins.trac.wordpress.org/browser/forminator/tags/1.57.3/library/modules/quizzes/front/front-mail.php#L36
  - url: >-
      https://plugins.trac.wordpress.org/browser/forminator/tags/1.57.3/library/abstracts/abstract-class-front-action.php#L127
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&old=3745883%40forminator&new=3745883%40forminator
tags:
  - cve.org
epss: 0.0028
epssPercentile: 0.19142
ingestedAt: '2026-10-16T04:58:47.496Z'
---

## Overview

The Forminator Forms – Contact Form, Payment Form & Custom Form Builder plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up to, and including, 1.58.1. This is due to the forminator_replace_quiz_form_data() helper invoking do_shortcode() on the fully expanded notification body once the {quiz_result} merge tag has been substituted, while the earlier-substituted {user_agent} and {refer_url} merge tags carry unauthenticated attacker-controlled bytes (the User-Agent header and the referer_url POST parameter) through sanitize_text_field()/esc_html(), neither of which strip the '[' and ']' shortcode delimiters. This makes it possible for unauthenticated attackers to execute arbitrary WordPress shortcodes registered on the site by submitting a quiz whose notification template contains {quiz_result}; the resulting impact depends on the shortcodes exposed by other installed plugins/themes and can range from arbitrary content injection to information disclosure.

## Affected

- `forminator_forms_contact_form_payment_form_custom_form_builder <= 1.58.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.