# Newsletters <= 4.18.1 - Unauthenticated SQL Injection via Subscriber Management 'id' Parameter

- **ID:** WPSEC-2026-1337
- **Plugin:** Newsletters (`newsletters-lite`), https://wordpress.org/plugins/newsletters-lite/
- **Affected versions:** all versions before 4.18.2
- **Fixed in:** 4.18.2 (Update to 4.18.2 or later.)
- **Severity:** High 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
- **Weakness:** CWE-89
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-21)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/newsletters-lite
- **Fix released:** 2026-10-20
- **Published:** 2026-10-21
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1337/

## Description

The Newsletters plugin for WordPress is vulnerable to SQL Injection via the 'id' parameter of the subscriber profile management form (managementsavefields AJAX action) in all versions up to, and including, 4.18.1, due to the client-supplied 'id' being passed to the subscriber save routine and concatenated without escaping or preparation into the WHERE clause of the UPDATE query. This makes it possible for unauthenticated attackers with a subscriber management session, which any visitor can get by subscribing to a list, to append additional SQL to the existing query. This can be used to extract sensitive information from the database or to modify other subscribers' records.

## References

- https://wpsec.com/vuln/WPSEC-2026-1337/
- https://plugins.svn.wordpress.org/newsletters-lite/tags/4.18.2/
- https://wordpress.org/plugins/newsletters-lite/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1337/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.