WPO365 Microsoft 365 Graph Mailer Plugin up to 6.2 on WordPress Subject cross site scripting

Summaryinfo

A vulnerability was found in WPO365 Microsoft 365 Graph Mailer Plugin up to 6.2. It has been rated as problematic. The impacted element is an unknown function. Performing a manipulation of the argument Subject results in cross site scripting. This vulnerability was named CVE-2026-107759. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in WPO365 Microsoft 365 Graph Mailer Plugin up to 6.2. It has been classified as problematic. This affects an unknown function. The manipulation of the argument Subject with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

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.

The advisory is shared at wordfence.com. This vulnerability is uniquely identified as CVE-2026-107759 since 10/08/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• WPO365

Name

• Microsoft 365 Graph Mailer Plugin

Version

• 6.0
• 6.1
• 6.2

License

• commercial

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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