Vulnerability · Published Jul 14, 2026 · Assigned by WPScan

CVE-2026-12583Newsletters < 4.15 - Unauthenticated PHP Object Injection via Subscriber Custom Field

High 8.1

In plain English

A high-severity unsafe deserialization in Newsletters from Unknown. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 2.0% (higher than 81% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei.

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)2.0%top 18.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling1Nuclei

Official description

The Newsletters WordPress plugin before 4.15 does not prevent deserialization of untrusted input that is stored through a public form, allowing unauthenticated attackers to inject a PHP object and, via a property-oriented gadget chain bundled with the Newsletters WordPress plugin before 4.15, write arbitrary files and execute code on the server.

Affected products (as reported)

Vendor	Product	Versions
Unknown	Newsletters	0 – before 4.15

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References

https://wpscan.com/vulnerability/e4c44105-f43d-4dff-8487-7d8ae2691c4e/ exploit, vdb-entry, technical-description