GHSA-5P9M-8JQC-CP3G

Vulnerability from github – Published: 2026-10-02 09:31 – Updated: 2026-10-02 09:31
VLAI
Details

The Newsletter – Send awesome emails from WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'np1' Custom Field Parameter in all versions up to, and including, 9.4.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The subscription endpoint (na=sa) requires no nonce, no capability check, and no CAPTCHA, and the payload can be smuggled past email-address validation by embedding the {profile_1} placeholder in the local part of the submitted address, since WordPress's is_email() permits curly braces there.

Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
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{
  "affected": [],
  "aliases": [
    "CVE-2026-96566"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-02T08:17:04Z",
    "severity": "HIGH"
  },
  "details": "The Newsletter \u2013 Send awesome emails from WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via \u0027np1\u0027 Custom Field Parameter in all versions up to, and including, 9.4.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The subscription endpoint (na=sa) requires no nonce, no capability check, and no CAPTCHA, and the payload can be smuggled past email-address validation by embedding the {profile_1} placeholder in the local part of the submitted address, since WordPress\u0027s is_email() permits curly braces there.",
  "id": "GHSA-5p9m-8jqc-cp3g",
  "modified": "2026-10-02T09:31:20Z",
  "published": "2026-10-02T09:31:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-96566"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/classes.php#L212"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module-base.php#L1032"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module.php#L1006"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/plugin.php#L457"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/profile/profile.php#L511"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/subscription/subscription.php#L257"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/subscription/subscription.php#L723"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026old=3711290%40newsletter\u0026new=3711290%40newsletter"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/6e61119c-b83e-41b4-aa14-7dc61086520d?source=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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