CVE-2026-12583
High
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.
SeverityHigh
CVSS8.1
Exploit probability—
ProductNewsletters
PublishedJul 14, 2026
First seenJul 14, 2026
Weakness typeCWE-502Deserialization of untrusted data
How to fix
Update
- Newsletters4.15 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Newsletters | v < 4.15 | 4.15 |
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