---
id: CVE-2026-0551
title: >-
  The PPWP – Password Protect Pages plugin for WordPress is vulnerable to PHP
  Object Injection in all versions up to, and including, 1.9.18 via
  deserialization of untrusted input from the 'post_protection_roles' vulnerable
  parameter
summary: >-
  The PPWP – Password Protect Pages plugin for WordPress is vulnerable to PHP
  Object Injection in all versions up to, and including, 1.9.18 via
  deserialization of untrusted input from the 'post_protection_roles' vulnerable
  parameter. This …
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-502
published: '2026-08-23'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T16:10:00.220'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-0551'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/password-protect-page/trunk/includes/services/class-ppw-passwords.php#L699
    label: security@wordfence.com
  - url: 'https://plugins.trac.wordpress.org/changeset/3567221/password-protect-page'
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/b8f53282-740e-4ac3-a2e1-7a97893e3355?source=cve
    label: security@wordfence.com
tags:
  - nvd
epss: 0.00749
epssPercentile: 0.53649
ingestedAt: '2026-10-12T16:57:59.886Z'
---

## Overview

The PPWP – Password Protect Pages plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 1.9.18 via deserialization of untrusted input from the 'post_protection_roles' vulnerable parameter. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.

## Remediation

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