CVE-2026-12583

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

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

Newsletters

CVSS v3.1 CNA

8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.55% chance of exploitation in the next 30 days, 45th percentile

Published

2026-07-14

Proof-of-concept exploits (1)

• https://wpscan.com/vulnerability/e4c44105-f43d-4dff-8487-7d8ae2691c4e/

References

• CVE Record
• NVD entry