CVE-2026-107759 Details
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.
A stored cross-site scripting vulnerability has been identified in the WPO365 Microsoft 365 Graph Mailer plugin for WordPress, affecting all versions up to and including 6.2. The issue arises from inadequate input sanitization and output escaping, allowing unauthenticated attackers to inject arbitrary web scripts into pages. These scripts execute when a user accesses the compromised page. The vulnerability can be exploited through any mail-sending feature that includes a user-controlled subject, such as a Contact Form 7 form, while the Graph Mailer is active and OAuth authorization has not been completed, which is the default state after the plugin is activated.
Users can update to WPO365 Microsoft 365 Graph Mailer version 6.3 or later, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 31, 2026CISA-ADP
Assessed Nov 1, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| WPO365 Microsoft 365 Graph Mailer | <= 6.2 |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 1, 2026 | CVE Modified | CISA-ADP |
| Oct 31, 2026 | New CVE Received | [email protected] |