{
 "id": "WPSEC-2026-1744",
 "url": "https://wpsec.com/vuln/WPSEC-2026-1744/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-1744/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-1744/index.md",
 "title": "Co-Authors Plus <= 4.1.2 - Authenticated (Contributor+) Missing Authorization to Guest Author Account Linking",
 "description": "The Co-Authors Plus plugin for WordPress is vulnerable to unauthorized modification of data via the guest author 'linked account' field in all versions up to, and including, 4.1.2, due to a missing capability check when a guest author is saved. Guest authors use the default post capabilities, and the add-guest-author capability defaults to edit_posts. This makes it possible for authenticated attackers with Contributor-level access and above to create or edit a guest author linked to any WordPress user account. The guest author then replaces that user on bylines across the site, showing the attacker's chosen name, biography and website.",
 "plugin": {
  "slug": "co-authors-plus",
  "name": "Co-Authors Plus",
  "full_name": "Co-Authors Plus",
  "wordpress_org": "https://wordpress.org/plugins/co-authors-plus/",
  "advisories_url": "https://wpsec.com/vuln/plugin/co-authors-plus/",
  "attacksurface": "https://attacksurface.wpsec.com/plugin/co-authors-plus"
 },
 "type": "NO AUTHORISATION",
 "cwe": [
  "CWE-862"
 ],
 "cve": [],
 "cvss": {
  "version": "3.1",
  "score": 4.3,
  "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
  "severity": "Medium"
 },
 "affected": {
  "ranges": [
   {
    "from": "3.0",
    "from_inclusive": true,
    "to": "4.1.3",
    "to_inclusive": false
   }
  ],
  "text": [
   "from 3.0 before 4.1.3"
  ]
 },
 "introduced_in": "3.0",
 "fixed_in": "4.1.3",
 "remediation": "Update to 4.1.3 or later.",
 "fix_released": "2026-10-26T12:31:54+00:00",
 "published": "2026-10-27T13:53:32+00:00",
 "updated": "2026-10-27T13:39:31.680937+00:00",
 "also_published_as": null,
 "references": [
  "https://wpsec.com/vuln/WPSEC-2026-1744/",
  "https://plugins.svn.wordpress.org/co-authors-plus/tags/4.1.3/",
  "https://wordpress.org/plugins/co-authors-plus/"
 ],
 "attacksurface_url": "https://attacksurface.wpsec.com/plugin/co-authors-plus",
 "source": "WPSec",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/"
 },
 "usage": {
  "plugin": "Medium",
  "affected_versions": "Medium",
  "as_of": "2026-10-27"
 }
}