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Fact-check summary

Wordfence reports the WPO365 Microsoft 365 Graph Mailer stored XSS vulnerability affecting versions through 6.2.

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Home/Security/WPO365 Microsoft 365 Graph Mailer plugin vulnerable to stored XSS through 6.2
VERIFIEDBy Xavier Rivera·Tuesday, November 3, 2026 at 7:44 PM AST·1 min read

WPO365 Microsoft 365 Graph Mailer plugin vulnerable to stored XSS through 6.2

The WPO365 Microsoft 365 Graph Mailer WordPress plugin is vulnerable to stored cross-site scripting in versions through 6.2. Unauthenticated attackers can inject scripts via any mail-sending feature that accepts a submitter-controlled subject when OAuth setup is incomplete.

Source:NVD
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WPO365 Microsoft 365 Graph Mailer plugin vulnerable to stored XSS through 6.2
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TL;DRAI · 60 sec read

The WPO365 Microsoft 365 Graph Mailer plugin for WordPress has a stored XSS flaw, CVE-2026-107759, in versions through 6.2. Wordfence, the CNA, rates it 7.2 under CVSS 3.1; NVD has not scored it. Unauthenticated attackers can inject scripts through the email subject on forms such as Contact Form 7 when OAuth setup is incomplete, the default right after activation.

The WPO365 | Microsoft 365 Graph Mailer plugin for WordPress contains a stored cross-site scripting vulnerability, tracked as CVE-2026-107759, in all versions up to and including 6.2.
Unauthenticated attackers can store arbitrary scripts via mail-sending features.
Wordfence, the CNA, rates it 7.2 (High) under CVSS 3.1. The vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N. NVD has not scored the CVE.
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The flaw stems from insufficient input sanitization and output escaping on the email Subject passed through wp_mail/PHPMailer.

Unauthenticated attackers can store scripts through ordinary mail-sending features. Any feature that forwards a submitter-controlled subject, such as a Contact Form 7 form, can deliver the payload when the Graph Mailer is enabled but OAuth authorization has not been completed, which NVD notes is the default state immediately after plugin activation. Injected scripts run whenever a user opens an affected page (CWE-79).
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Sources: NVD; Wordfence.
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