# CVE-2026-107759: CVE-2026-107759

Status: published. Published: 2026-10-31. Updated: 2026-11-01.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

Not reported in collected sources.

## Severity and prioritization

- CVSS 3.1: 7.2 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N; source: NVD: security@wordfence.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation none; automatable no; technical impact partial; source NVD SSVC: 134c704f-9b21-4f2e-91b3-4a467353bcc0

- Weaknesses: CWE-79

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Core/Script_Helpers.php#L142 (security@wordfence.com)

- https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Mail/Mailer.php#L71 (security@wordfence.com)

- https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Services/Ajax_Service.php#L284 (security@wordfence.com)

- https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Services/Log_Service.php#L80 (security@wordfence.com)

- https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/apps/dist/wizard-chunk-G9IB6WhS.js#L154 (security@wordfence.com)

- https://plugins.trac.wordpress.org/changeset?reponame=&old=3752919%40wpo365-msgraphmailer&new=3752919%40wpo365-msgraphmailer (security@wordfence.com)

- https://www.wordfence.com/threat-intel/vulnerabilities/id/d51ba0c2-588d-4241-977a-9649cb77c78e?source=cve (security@wordfence.com)

## Provenance

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-107759; retrieved 2026-11-02; source updated 2026-11-01

Revision: aeba9ba3030b5136eb8a1348073e35eb2d6dbe32771c8aa05ba2f61c1e6b9cec

Canonical: https://y2.dev/cve/CVE-2026-107759