Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Core/Sc
- https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Mail/Ma
- https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Service
- https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Service
- https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/apps/di
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3752919%40wpo365-msgr
- https://www.wordfence.com/threat-intel/vulnerabilities/id/d51ba0c2-588d-4241-977
FAQ
What is CVE-2026-107759?
CVE-2026-107759 is a vulnerability with a CVSS score of 7.2 (HIGH). 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 ...
How severe is CVE-2026-107759?
CVE-2026-107759 has been rated HIGH with a CVSS base score of 7.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-107759?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.