CVE-2026-107759

The WPO365 | MICROSOFT 365 GRAPH MAILER plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'Subject (via wp_mail/PHPMailer, e.g. CF7 your-subject)' parameter in all versions up to, and including, 6.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload is stored without authentication via any mail-sending feature that forwards a submitter-controlled subject (e.g. a Contact Form 7 form) when the Graph Mailer is enabled but OAuth authorization has not been completed, a default state immediately after plugin activation.

• CWE-79

• https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Core/Script_Helpers.php#L142
• https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Mail/Mailer.php#L71
• https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Services/Ajax_Service.php#L284
• https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Services/Log_Service.php#L80
• https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/apps/dist/wizard-chunk-G9IB6WhS.js#L154
• https://plugins.trac.wordpress.org/changeset?reponame=&old=3752919%40wpo365-msgraphmailer&new=3752919%40wpo365-msgraphmailer
• https://www.wordfence.com/threat-intel/vulnerabilities/id/d51ba0c2-588d-4241-977a-9649cb77c78e?source=cve

Published

Oct 31, 2026

Last Modified

Nov 2, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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