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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Newsletters | < 4.15 | 4.15 |
Automated scanner template
A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.
- Newsletters < 4.15 - Unauthenticated PHP Object Injection via Subscriber Custom Field http/cves/2026/CVE-2026-12583.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.
References
- https://wpscan.com/vulnerability/e4c44105-f43d-4dff-8487-7d8ae2691c4e/ exploit vdb-entry technical-description