{
 "id": "WPSEC-2026-2744",
 "url": "https://wpsec.com/vuln/WPSEC-2026-2744/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-2744/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-2744/index.md",
 "title": "Co-Authors Plus <= 4.2.1 - Authenticated (Contributor+) Guest Author Spoofing via Post Meta",
 "description": "The Co-Authors Plus plugin for WordPress is vulnerable to guest author spoofing via 'cap-' prefixed custom fields in all versions up to, and including, 4.2.1, due to the guest author lookups by user_login, linked_account and user_email, and the linked-account list, querying post meta without limiting the results to the guest-author post type. This makes it possible for authenticated attackers with Contributor-level access and above to add 'cap-' custom fields to a post they can edit so that it is treated as a guest author profile. For example, a 'cap-linked_account' value naming another user makes the attacker-controlled display name, bio and website appear in that user's byline across the site.",
 "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": "CONTENT INJECTION",
 "cwe": [
  "CWE-345"
 ],
 "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": "4.2.2",
    "to_inclusive": false
   }
  ],
  "text": [
   "all versions before 4.2.2"
  ]
 },
 "introduced_in": null,
 "fixed_in": "4.2.2",
 "remediation": "Update to 4.2.2 or later.",
 "fix_released": "2026-11-07T16:23:19+00:00",
 "published": "2026-11-08T16:41:10+00:00",
 "updated": "2026-11-08T13:07:58.484128+00:00",
 "also_published_as": null,
 "references": [
  "https://wpsec.com/vuln/WPSEC-2026-2744/",
  "https://plugins.svn.wordpress.org/co-authors-plus/tags/4.2.2/",
  "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": "2026-11-08"
 }
}