CVE-2026-66596

WordPress Newsletter plugin <= 9.3.3 - Cross Site Scripting (XSS) vulnerability

Published Aug 19, 2026 CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed
Description
Unauthenticated Cross Site Scripting (XSS) in Newsletter <= 9.3.3 versions.

Remediation

Vendor Solution

Update the WordPress Newsletter Plugin to the latest available version (at least 9.3.4).

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Stefanno Lissa
Stefanno Lissa newsletter
Wordpress
Wordpress wordpress
Vendors & Products Stefanno Lissa
Stefanno Lissa newsletter
Wordpress
Wordpress wordpress
Type Values Removed Values Added
Description Unauthenticated Cross Site Scripting (XSS) in Newsletter <= 9.3.3 versions.
Title WordPress Newsletter plugin <= 9.3.3 - Cross Site Scripting (XSS) vulnerability
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Patchstack
Published
Updated
Aug 19, 2026, 7:38 PM
Reserved
Jul 27, 2026, 2:00 PM
Status
Deferred
Published
Aug 19, 2026, 1:17 PM
Modified
Aug 20, 2026, 12:48 PM