Cross Site Scripting Vulnerability in Newsletter Plugin by WordPress
CVE-2026-66596

7.1HIGH

Key Information:

Vendor

WordPress
Status
Newsletter
Vendor
CVE Published:
19 August 2026

What is CVE-2026-66596?

The Newsletter Plugin for WordPress versions 9.3.3 and earlier is susceptible to unauthenticated Cross Site Scripting (XSS) vulnerabilities. An attacker can exploit this weakness to inject arbitrary scripts into web pages viewed by users, posing a risk of cookie theft, session hijacking, and other malicious actions, affecting the security and privacy of site visitors.

Affected Version(s)

Newsletter <= 9.3.3

References

https://patchstack.com/database/wordpress/plugin/newslett...
vdb-entry

CVSS V3.1

Score:
7.1
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

daroo | Patchstack Bug Bounty Program
.