---
id: CVE-2026-92537
title: >-
  The Newsletter – Send awesome emails from WordPress plugin for WordPress is
  vulnerable to Insufficiently Protected Credentials in all versions up to, and
  including, 9.3.9 The plugin's public click-tracking REST route `/tnp/l/` is
  registe…
summary: >-
  The Newsletter – Send awesome emails from WordPress plugin for WordPress is
  vulnerable to Insufficiently Protected Credentials in all versions up to, and
  including, 9.3.9 The plugin's public click-tracking REST route `/tnp/l/` is
  registe…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-522
vendor: satollo
product: Newsletter – Send awesome emails from WordPress
affected:
  - newsletter_send_awesome_emails_from_wordpress <= 9.3.9
published: '2026-10-01'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T03:16:59.667'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92537'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module-base.php#L1209
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module-base.php#L441
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module.php#L403
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/statistics/statistics.php#L107
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/statistics/statistics.php#L174
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/statistics/statistics.php#L335
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&new=3709894%40newsletter%2Ftags%2F9.4.0&old=3695457%40newsletter%2Ftags%2F9.3.9
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/ed68a4ff-a2aa-4df7-96b1-f094bce4b9b7?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-01T03:36:04.806Z'
---

## Overview

The Newsletter – Send awesome emails from WordPress plugin for WordPress is vulnerable to Insufficiently Protected Credentials in all versions up to, and including, 9.3.9 The plugin's public click-tracking REST route `/tnp/l/` is registered with `permission_callback => '__return_true'` and, upon receiving a valid keyed-MD5 signature, calls `set_user_cookie()`, which emits a `Set-Cookie: newsletter=<id>-<raw_token>` response header to the requester because the subscriber object loaded via `get_user()` lacks the `_trusted` property, causing `get_user_key()` to return the raw token column value instead of its MD5-masked variant. This makes it possible for unauthenticated attackers who obtain any signed click-tracking URL for a target subscriber to receive that subscriber's permanent raw authentication cookie, which they can then use to export the subscriber's full PII record via the JSON profile-export endpoint (`?na=px`), rewrite the subscriber's stored profile (`?na=ps`), and silently unsubscribe the subscriber via the RFC-8058 one-click endpoint (`?na=ocu`), none of which require a nonce, password, or email challenge. Signed tracking URLs are embedded in every external link of every newsletter delivered to a subscriber, carry no timestamp, and never expire until the site's relink key rotates, meaning that any party who observes such a URL — through a forwarded email, a shared inbox, a mail-gateway log, or Referer headers on the redirect target, which has no Referrer-Policy set — can replay it indefinitely to obtain the victim's credential.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.