CVE-2026-12583highCWE-502

CVE-2026-12583: high-severity vulnerability in Newsletters

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

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41Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 8.1epss 0.6%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Unknown · Newsletters
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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