Newsletters <= 4.18.1 - Unauthenticated PHP Object Injection via Database Update Notice Dismissal
- ID
- WPSEC-2026-1338
- Plugin
- Newsletters (newsletters-lite)
- Affected
- all versions before 4.18.2
- Remediation
- Update to 4.18.2 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness
- CWE-502
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-10-21
- Attack surface
- Newsletters on WPSec AttackSurface
- Fix released
- Published
Description
The Newsletters plugin for WordPress is vulnerable to PHP Object Injection via the 'version' parameter of the database update notice dismissal ('hidemessage') handler in all versions up to, and including, 4.18.1, due to the handler running on the init hook with no capability check or nonce, storing the value in the 'hidedbupdate' option, and the plugin passing that stored value through maybe_unserialize() again when it reads it back. This makes it possible for unauthenticated attackers to inject a PHP object. No known POP chain is present in the vulnerable software. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.
References
- https://wpsec.com/vuln/WPSEC-2026-1338/
- https://plugins.svn.wordpress.org/newsletters-lite/tags/4.18.2/
- https://wordpress.org/plugins/newsletters-lite/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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