{
 "id": "WPSEC-2026-2986",
 "url": "https://wpsec.com/vuln/WPSEC-2026-2986/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-2986/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-2986/index.md",
 "title": "Newsletters <= 4.18.2 - Unauthenticated PHP Object Injection via Date Custom Field",
 "description": "The Newsletters plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 4.18.2 via deserialization of untrusted input when rendering Date custom fields in the Bootstrap (default2) theme. Submitted request values, such as those posted to the front-end AJAX field refresh action, are passed to maybe_unserialize(). This makes it possible for unauthenticated attackers to inject a PHP object when a Date custom field is in use. No known POP chain is present in the plugin itself; if a POP chain is present via another plugin or theme installed on the target system, it may allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.",
 "plugin": {
  "slug": "newsletters-lite",
  "name": "Newsletters",
  "full_name": "Newsletters",
  "wordpress_org": "https://wordpress.org/plugins/newsletters-lite/",
  "advisories_url": "https://wpsec.com/vuln/plugin/newsletters-lite/",
  "attacksurface": "https://attacksurface.wpsec.com/plugin/newsletters-lite"
 },
 "type": "OBJECT INJECTION",
 "cwe": [
  "CWE-502"
 ],
 "cve": [],
 "cvss": {
  "version": "3.1",
  "score": 8.1,
  "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "severity": "High"
 },
 "affected": {
  "ranges": [
   {
    "from": null,
    "from_inclusive": true,
    "to": "4.18.3",
    "to_inclusive": false
   }
  ],
  "text": [
   "all versions before 4.18.3"
  ]
 },
 "introduced_in": null,
 "fixed_in": "4.18.3",
 "remediation": "Update to 4.18.3 or later.",
 "fix_released": "2026-11-10T18:16:01+00:00",
 "published": "2026-11-12T17:52:14+00:00",
 "updated": "2026-11-12T17:14:56.249570+00:00",
 "also_published_as": null,
 "references": [
  "https://wpsec.com/vuln/WPSEC-2026-2986/",
  "https://plugins.svn.wordpress.org/newsletters-lite/tags/4.18.3/",
  "https://wordpress.org/plugins/newsletters-lite/"
 ],
 "attacksurface_url": "https://attacksurface.wpsec.com/plugin/newsletters-lite",
 "source": "WPSec",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/"
 },
 "usage": {
  "plugin": "Low",
  "affected_versions": "Low",
  "as_of": "2026-11-12"
 }
}