WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN) <= 45.0 - Unauthenticated Missing Authorization to Graph Mailer Authorization Reset
- ID
- WPSEC-2026-1258
- Plugin
- WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN) (wpo365-login)
- Affected
- all versions before 45.1
- Remediation
- Update to 45.1 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weakness
- CWE-862
- Usage
- Plugin Medium · Affected versions Medium among sites WPSec scans, 2026-10-20
- Attack surface
- WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN) on WPSec AttackSurface
- Fix released
- Published
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.
References
- https://wpsec.com/vuln/WPSEC-2026-1258/
- https://plugins.svn.wordpress.org/wpo365-login/tags/45.1/
- https://wordpress.org/plugins/wpo365-login/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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