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CVE-2026-107759

HIGH 7.2 CVSS 3.1
Published
October 31, 2026
Last modified
November 2, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

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.

Affected WordPress components

  • WPO365 | MICROSOFT 365 GRAPH MAILER Plugin · wpo365-msgraphmailer
    Confirmed match Active
    Up to and including 6.2
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • wpo365 WPO365 | MICROSOFT 365 GRAPH MAILER — Up to and including 6.2

References

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