CVE-2026-66596 - WordPress Newsletter plugin <= 9.3.3 - Cross Site Scripting (XSS) vulnerability

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HIGH

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

Published Aug 19, 2026

7.1

HIGH

CVSS 3.1

EPSS 0.25%

Description

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

Affected products

Vendor Stefano Lissa Product Newsletter Default
unaffected
- Version
  -
  Status
  affected
  Constraints
  <=9.3.3

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Stefano Lissa

Newsletter

unaffected

Version	Status	Constraints
-	affected	<=9.3.3

Remediation

Vendor solution

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

Weaknesses (1)

CWE-79

Cross-site Scripting (XSS)

References (1)

https://patchstack.com/database/wordpress/plugin/newsletter/vulnerability/wordpress-newsletter-plugin-9-3-3-cross-site-scripting-xss-vulnerability?_s_id=cve
vdb-entry

Link	Providers	Tags
https://patchstack.com/database/wordpress/plugin/newsletter/vulnerability/wordpress-newsletter-plugin-9-3-3-cross-site-scripting-xss-vulnerability?_s_id=cve		vdb-entry

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner Patchstack

Published Aug 19, 2026

Updated Aug 19, 2026

Reserved Jul 27, 2026

Link CVE-2026-66596

CISA Vulnrichment

Updated Aug 19, 2026

NVD

Status Deferred

Modified Aug 20, 2026

Link CVE-2026-66596

Red Hat

Severity n/a

Public date n/a

Links CVE-2026-66596

ENISA EUVD

Assigner n/a

Published n/a

Updated n/a

Exploited since n/a

Link n/a