---
title: "CVE-2026-96566: The Newsletter WordPress Plugin - Stored XSS"
description: "The Newsletter WordPress plugin <= 9.4.0 contains a stored cross-site scripting caused by insufficient input sanitization and output escaping in the 'np1' custom field parameter, letting unauthenticated attackers inject scripts executed when users access injected pages, exploit requires no authentication or capability checks."
url: https://panop.io/threat-heartbeat/CVE-2026-96566/
---

# CVE-2026-96566 The Newsletter WordPress Plugin - Stored XSS

The Newsletter WordPress plugin <= 9.4.0 contains a stored cross-site scripting caused by insufficient input sanitization and output escaping in the 'np1' custom field parameter, letting unauthenticated attackers inject scripts executed when users access injected pages, exploit requires no authentication or capability checks.

CVSS base score 7.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.27% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-96566)

## Details

Type

Stored XSS

Impact

Stored XSS, Client Script Exec

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Published

2 October 2026

Updated

15 October 2026

Weakness

[CWE-79](https://cwe.mitre.org/data/definitions/79.html)

## Vendor fix

Update to a version later than 9.4.0 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-96566](https://nvd.nist.gov/vuln/detail/CVE-2026-96566)
- [https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/classes.php#L212](https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/classes.php#L212)
- [https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module.php#L1006](https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module.php#L1006)
- [https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/profile/profile.php#L511](https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/profile/profile.php#L511)
- [https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/subscription/subscription.php#L257](https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/subscription/subscription.php#L257)
- [https://www.wordfence.com/threat-intel/vulnerabilities/id/6e61119c-b83e-41b4-aa14-7dc61086520d?source=cve](https://www.wordfence.com/threat-intel/vulnerabilities/id/6e61119c-b83e-41b4-aa14-7dc61086520d?source=cve)
- [https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module-base.php#L1032](https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module-base.php#L1032)
- [https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/plugin.php#L457](https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/plugin.php#L457)
- [https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/subscription/subscription.php#L723](https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/subscription/subscription.php#L723)
- [https://plugins.trac.wordpress.org/changeset?reponame=&old=3711290%40newsletter&new=3711290%40newsletter](https://plugins.trac.wordpress.org/changeset?reponame=&old=3711290%40newsletter&new=3711290%40newsletter)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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