Newsletters <= 4.18.2 - Unauthenticated PHP Object Injection via Date Custom Field
- ID
- WPSEC-2026-2986
- Plugin
- Newsletters (newsletters-lite)
- Affected
- all versions before 4.18.3
- Remediation
- Update to 4.18.3 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, 2026-11-12
- Attack surface
- Newsletters on WPSec AttackSurface
- Fix released
- Published
Description
The Newsletters plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 4.18.2 via deserialization of untrusted input when rendering Date custom fields in the Bootstrap (default2) theme. Submitted request values, such as those posted to the front-end AJAX field refresh action, are passed to maybe_unserialize(). This makes it possible for unauthenticated attackers to inject a PHP object when a Date custom field is in use. No known POP chain is present in the plugin itself; if a POP chain is present via another plugin or theme installed on the target system, it may allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.
References
- https://wpsec.com/vuln/WPSEC-2026-2986/
- https://plugins.svn.wordpress.org/newsletters-lite/tags/4.18.3/
- https://wordpress.org/plugins/newsletters-lite/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
This advisory as JSON or Markdown · All advisories: JSON, RSS