CVE-2026-66596 PUBLISHED

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

Assigner: Patchstack
Reserved: 27.07.2026 Published: 19.08.2026 Updated: 19.08.2026

Unauthenticated Cross Site Scripting (XSS) in Newsletter <= 9.3.3 versions.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
CVSS Score: 7.1

Product Status

Vendor Stefano Lissa
Product Newsletter
Versions Default: unaffected
  • affected from n/a to 9.3.3 (incl.)

Solutions

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

Credits

  • daroo | Patchstack Bug Bounty Program finder

References

Problem Types

  • CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CWE

Impacts

  • CAPEC-588 DOM-Based XSS