Deserialization Vulnerability in Newsletters Plugin by WordPress
CVE-2026-12583

Currently unrated

Key Information:

Vendor

WordPress
Status
Newsletters
Vendor
CVE Published:
14 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-12583?

The Newsletters plugin for WordPress, prior to version 4.15, is susceptible to a deserialization vulnerability that arises from the handling of untrusted input via public forms. This flaw permits unauthenticated attackers to inject PHP objects, leveraging a property-oriented gadget chain inherent in the plugin, ultimately resulting in unauthorized file writes and arbitrary code execution on the server. It underscores the necessity for users to update their plugins promptly to mitigate potential risks.

Affected Version(s)

Newsletters 0 < 4.15

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-2026-12583 - Proof of Concept

References

https://wpscan.com/vulnerability/e4c44105-f43d-4dff-8487-...
exploitvdb-entrytechnical-description

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Yaswanth Reddy Sunkara
WPScan
.