PHP Object Injection Vulnerability in Newsletters Plugin for WordPress
CVE-2026-16267

8.1HIGH

Key Information:

Vendor

WordPress
Status
Newsletters
Vendor
CVE Published:
8 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-16267?

The Newsletters plugin for WordPress, prior to version 4.16, is susceptible to a PHP Object Injection vulnerability. This flaw occurs due to improper handling of unserialised data retrieved from public form submissions. Attackers, without authentication, can exploit this weakness to inject malicious PHP objects, potentially leading to significant security issues within the WordPress environment.

Affected Version(s)

Newsletters 0 < 4.16

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-16267 - Proof of Concept

References

https://wpscan.com/vulnerability/b51c11d6-5bfa-4b2c-b348-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Sai Praneeth Koti
WPScan
.