Vulnerabilities / Newsletters / WPSEC-2026-2987
Newsletters <= 4.18.2 - Unauthenticated SQL Injection via 'instance[lists]' Parameter
High 7.5
CWE-89Fixed in 4.18.3
- ID
- WPSEC-2026-2987
- 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:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness
- CWE-89
- 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 SQL Injection via the 'instance[lists]' parameter of the front-end AJAX field refresh action in all versions up to, and including, 4.18.2 due to insufficient escaping of the user-supplied mailing list IDs and the lack of preparation of the mailing list selection query. This makes it possible for unauthenticated attackers, using the nonce exposed on public pages, to append additional SQL queries to existing queries and extract sensitive information from the database.
References
- https://wpsec.com/vuln/WPSEC-2026-2987/
- 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.
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