{
 "id": "WPSEC-2026-1746",
 "url": "https://wpsec.com/vuln/WPSEC-2026-1746/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-1746/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-1746/index.md",
 "title": "Co-Authors Plus <= 4.1.2 - Authenticated (Contributor+) Missing Authorization to Post Co-Author Modification via REST API and tax_input",
 "description": "The Co-Authors Plus plugin for WordPress is vulnerable to unauthorized modification of data via the REST API 'coauthors' parameter and the 'tax_input' post field in all versions up to, and including, 4.1.2, due to the author taxonomy using WordPress's default assign_terms capability (edit_posts) instead of the plugin's set-authors check (edit_others_posts by default). This makes it possible for authenticated attackers with Contributor-level access and above, who are not permitted to set authors, to change or clear the co-authors (bylines) of posts they can edit, for example crediting their own posts to other users.",
 "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": null,
    "from_inclusive": true,
    "to": "4.1.3",
    "to_inclusive": false
   }
  ],
  "text": [
   "all versions before 4.1.3"
  ]
 },
 "introduced_in": null,
 "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-2026-1746/",
  "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"
 }
}