---
id: CVE-2026-120070
title: >-
  User Frontend <= 4.3.13 - Authenticated (Subscriber+) Privilege Escalation via
  post_content Parameter
summary: >-
  The User Frontend – Membership, User Registration, User Profile, User
  Directory & Content Restriction with Frontend Post Submission plugin for
  WordPress is vulnerable to Privilege Escalation in all versions up to, and
  including, 4.3.13 v…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-269
vendor: wedevs
product: >-
  User Frontend – Membership, User Registration, User Profile, User Directory &
  Content Restriction with Frontend Post Submission
affected:
  - >-
    user_frontend_membership_user_registration_user_profile_user_directory_content_restriction_with_frontend_post_submission
    <= 4.3.13
published: '2026-10-31'
updated: '2026-10-31'
sourceUpdated: '2026-10-31T07:46:53.190Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120070'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/f84b6767-f254-45c9-8e78-36d4beac2a98?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-user-frontend/tags/4.3.13/includes/Ajax/Frontend_Form_Ajax.php#L253
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-user-frontend/tags/4.3.13/includes/Ajax/Frontend_Form_Ajax.php#L132
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-user-frontend/tags/4.3.13/includes/Frontend/Registration.php#L116
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-user-frontend/tags/4.3.13/includes/Frontend/Registration.php#L362
  - url: >-
      https://plugins.trac.wordpress.org/changeset/3770255/wp-user-frontend/trunk/includes/Ajax/Frontend_Form_Ajax.php
tags:
  - cve.org
epss: 0.00302
epssPercentile: 0.23072
ingestedAt: '2026-11-05T16:24:31.540Z'
---

## Overview

The User Frontend – Membership, User Registration, User Profile, User Directory & Content Restriction with Frontend Post Submission plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 4.3.13 via the `post_content` parameter of the `submit_post()` function. The vulnerability exists because the protected-shortcode blocklist guard inspects the `sanitize_textarea_field()` copy of the submitted `post_content`, while the copy actually persisted to the database is processed through `wp_kses()`, whose `wp_kses_no_null()` step strips C0 control bytes — allowing an attacker to inject a single `\x01` byte inside the `[wpuf-registration]` tag name to defeat the `strpos()` blocklist check while the clean, functional shortcode is stored verbatim; `strip_shortcodes()` does not neutralize the stored shortcode either, because the Frontend container that registers it via `add_shortcode()` is only instantiated when `is_admin()` is false, and `admin-ajax` requests have `is_admin() === true`. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject a `[wpuf-registration role="editor"]` shortcode into a published post, causing a live Editor-role registration form to be rendered publicly on the frontend that any visitor — or the attacker themselves — can submit to mint a WordPress Editor account with an immediately active privileged session when the default `autologin_after_registration` setting is enabled.

## Affected

- `user_frontend_membership_user_registration_user_profile_user_directory_content_restriction_with_frontend_post_submission <= 4.3.13`

## Remediation

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