---
id: CVE-2026-19804
title: >-
  The s2Member – Excellent for All Kinds of Memberships, Content Restriction
  Paywalls & Member Access Subscriptions plugin for WordPress is vulnerable to
  Remote Code Execution in all versions up to, and including, 260814 via the
  'first_nam…
summary: >-
  The s2Member – Excellent for All Kinds of Memberships, Content Restriction
  Paywalls & Member Access Subscriptions plugin for WordPress is vulnerable to
  Remote Code Execution in all versions up to, and including, 260814 via the
  'first_nam…
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'
cwe:
  - CWE-94
vendor: clavaque
product: >-
  s2Member – Excellent for All Kinds of Memberships, Content Restriction
  Paywalls & Member Access Subscriptions
affected:
  - >-
    s2member_excellent_for_all_kinds_of_memberships_content_restriction_paywalls_member_access_subscriptions
    <= 260814
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T14:17:18.497'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-19804'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/paypal-checkout-in.inc.php#L736
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/paypal-return-in-subscr-or-wa-w-level.inc.php#L311
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/paypal-return-in-subscr-or-wa-w-level.inc.php#L319
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/paypal-return-in.inc.php#L47
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/paypal-utilities.inc.php#L185
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/paypal-utilities.inc.php#L92
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/tracking-codes.inc.php#L71
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/utilities.inc.php#L49
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&old=3671073%40s2member&new=3671073%40s2member
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/e87da8fa-04cc-4b9a-9dde-be7d4f2bd76e?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
epss: 0.0104
epssPercentile: 0.62494
ingestedAt: '2026-09-25T08:01:56.751Z'
---

## Overview

The s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 260814 via the 'first_name' parameter parameter. This is due to insufficient sanitization of the first_name parameter via esc_refs(), which strips only regex backreferences and not PHP tags, before substitution into the eval'd Signup Tracking Codes template, combined with disclosure of the site-global proxy verification key that allows PayPal postback verification to be bypassed. This makes it possible for unauthenticated attackers to execute code on the server. Successful exploitation requires that the site administrator has configured a Signup Tracking Codes template containing the %%first_name%% placeholder (a documented, GUI-supported feature) and that the attacker has obtained the site-global proxy verification key, which is exposed in plaintext in the JSON response of any PayPal Checkout AJAX request on the target site.

## Remediation

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