WordPress security changelog
MEDIUM CVE-2026-75908 Deferred

Newsletters lets Authors mass-mail privileged users

Newsletters through 4.17 lets an Author or higher forge newsletters_mailinglistsroles during a normal post submission. The attacker-controlled role slug is passed to get_users(), allowing arbitrary newsletter email to be sent to any WordPress role, including Administrators, through the site's own outbound mail channel.

CVE / CNA score 4.3 CVSS 3.1 · security@wordfence.com
NVD score Pending NVD has not published its own CVSS assessment.
Component
Newsletters
Plugin slug
newsletters-lite
Affected
<= 4.17
Safe version
4.18
Published
Aug 25, 2026
Weakness
CWE-862 — Missing Authorization

This CVE was published Aug 25, 2026 and is one of 37 known issues for this plugin.

What to do

Update, patch or deactivate.

The official author release notes confirm remediation by 4.18; this does not establish that every intervening release was affected. Update the affected edition to 4.18 or a later maintained release on its supported branch. Review Author activity, outbound newsletter history and messages sent to privileged users for phishing attempts. Official author release notes: https://wordpress.org/plugins/newsletters-lite/.

A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical 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.

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References

Primary and upstream sources