Description
The Newsletters plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 4.17. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with author-level access and above, to send arbitrary newsletter emails to users of any WordPress role, including administrators, by forging POST fields during a normal post submission. This allows an attacker-supplied role slug via the newsletters_mailinglistsroles POST field to be passed directly to get_users(), enabling unauthorized mass-mailing and potential phishing against privileged site users through the site's own outbound email channel.
References6
- plugins.trac.wordpress.org/browser/newsletters-lite/tags/4.17/i…
- plugins.trac.wordpress.org/browser/newsletters-lite/tags/4.17/w…
- plugins.trac.wordpress.org/browser/newsletters-lite/tags/4.17/w…
- plugins.trac.wordpress.org/browser/newsletters-lite/tags/4.17/w…
- plugins.trac.wordpress.org/changeset?reponame=&old=3663788%40ne…
- www.wordfence.com/threat-intel/vulnerabilities/id/1d3eddce-1b41…
Metrics
- CVSS 3.1
-
4.3
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - EPSS — exploit probability
- 0% percentile: 33 · as of 9 November 2026
- CWE
- CWE-862
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.