---
id: CVE-2026-16267
title: >-
  The Newsletters WordPress plugin before 4.16 does not restrict the classes
  allowed when unserialising a value taken from a public form submission,
  allowing unauthenticated attackers to inject arbitrary PHP objects.
summary: >-
  The Newsletters WordPress plugin before 4.16 does not restrict the classes
  allowed when unserialising a value taken from a public form submission,
  allowing unauthenticated attackers to inject arbitrary PHP objects.
severity: none
published: '2026-08-08'
updated: '2026-08-08'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-16267'
references:
  - url: 'https://wpscan.com/vulnerability/b51c11d6-5bfa-4b2c-b348-cda19889deee/'
    label: contact@wpscan.com
tags:
  - nvd
epss: 0.00453
epssPercentile: 0.36637
ingestedAt: '2026-08-09T03:32:40.174Z'
---

## Overview

The Newsletters WordPress plugin before 4.16 does not restrict the classes allowed when unserialising a value taken from a public form submission, allowing unauthenticated attackers to inject arbitrary PHP objects.

## Remediation

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