{
 "id": "WPSEC-2026-1258",
 "url": "https://wpsec.com/vuln/WPSEC-2026-1258/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-1258/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-1258/index.md",
 "title": "WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN) <= 45.0 - Unauthenticated Missing Authorization to Graph Mailer Authorization Reset",
 "description": "The WPO365 plugin for WordPress is vulnerable to unauthorized modification of data in all versions up to, and including, 45.0, due to the mail authorization handler (Mail_Authorization_Helpers::authorize_mail_user) deleting the site's stored Graph Mailer authorization and cached application-level access token before the authorization response had been verified. This makes it possible for unauthenticated attackers to send a crafted mail authorization response, with any authorization code and a state that sets mode=mailAuthorize, that clears the existing delegated Microsoft Graph mail authorization. The site then cannot send email through the WPO365 Graph Mailer until an administrator authorizes it again.",
 "plugin": {
  "slug": "wpo365-login",
  "name": "WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN)",
  "full_name": "WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN)",
  "wordpress_org": "https://wordpress.org/plugins/wpo365-login/",
  "advisories_url": "https://wpsec.com/vuln/plugin/wpo365-login/",
  "attacksurface": "https://attacksurface.wpsec.com/plugin/wpo365-login"
 },
 "type": "NO AUTHORISATION",
 "cwe": [
  "CWE-862"
 ],
 "cve": [],
 "cvss": {
  "version": "3.1",
  "score": 5.3,
  "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
  "severity": "Medium"
 },
 "affected": {
  "ranges": [
   {
    "from": null,
    "from_inclusive": true,
    "to": "45.1",
    "to_inclusive": false
   }
  ],
  "text": [
   "all versions before 45.1"
  ]
 },
 "introduced_in": null,
 "fixed_in": "45.1",
 "remediation": "Update to 45.1 or later.",
 "fix_released": "2026-10-18T10:42:00+00:00",
 "published": "2026-10-20T10:08:26+00:00",
 "updated": "2026-10-20T09:12:40.788048+00:00",
 "also_published_as": null,
 "references": [
  "https://wpsec.com/vuln/WPSEC-2026-1258/",
  "https://plugins.svn.wordpress.org/wpo365-login/tags/45.1/",
  "https://wordpress.org/plugins/wpo365-login/"
 ],
 "attacksurface_url": "https://attacksurface.wpsec.com/plugin/wpo365-login",
 "source": "WPSec",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/"
 },
 "usage": {
  "plugin": "Medium",
  "affected_versions": "Medium",
  "as_of": "2026-10-20"
 }
}