Stored cross-site scripting in WPO365 Microsoft 365 Graph Mailer
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
The WPO365 | MICROSOFT 365 GRAPH MAILER plugin for WordPress in all versions up to and including 6.2 does not sanitize or escape the subject of mail sent via wp_mail, such as a Contact Form 7 subject, which enables stored cross-site scripting (CWE-79). An unauthenticated attacker can store scripts that execute when a user accesses an affected page, if the Graph Mailer is enabled but OAuth authorization has not been completed, a default state right after plugin activation.
Written with Claude Haiku 5.5 from the sources below · 2026-11-05
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
The sources list no fixed version for WPO365 | MICROSOFT 365 GRAPH MAILER.
Written with Claude Haiku 5.5 from the sources below · 2026-11-05
Timeline
- 2026-10-31 Threatist record created from CVE-2026-107759
- 2026-10-31 Alias added: GHSA-jg4v-r26p-p7r2
- 2026-11-01 Priority changed: MEDIUM → LOW
- 2026-11-01 CISA SSVC decision points changed
References
Other 7
- https://www.wordfence.com/threat-intel/vulnerabilities/id/d51ba0c2-588d-4241-977a-9649cb77c78e?source=cve
- https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/apps/dist/wizard-chunk-G9IB6WhS.js#L154
- https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Mail/Mailer.php#L71
- https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Services/Log_Service.php#L80
- https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Core/Script_Helpers.php#L142
- https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Services/Ajax_Service.php#L284
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3752919%40wpo365-msgraphmailer&new=3752919%40wpo365-msgraphmailer
More wpo365 vulnerabilities
- TI-2021-19351 WPO365 | LOGIN - Wordpress Plugin Persistent Cross-Site Scripting CVSS 3.1CRITICAL 9.3
- TI-2026-85151 Authentication bypass via SAML replay in WPO365 LOGIN plugin CVSS 4.0CRITICAL 9.1
- TI-2026-12809 Cross-site request forgery in WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION CVSS 3.1HIGH 8.8
- TI-2026-70259 Authentication bypass in WPO365 WordPress plugin via OIDC nonce replay CVSS 3.1HIGH 8.1
- TI-2020-16157 The wpo365-login plugin before v11.7 for WordPress allows use of a symmetric algorithm to… CVSS 3.1HIGH 7.5
- TI-2026-70212 Stored cross-site scripting in WPO365 Login WordPress plugin CVSS 3.1HIGH 7.2
Sources
- CVE-2026-107759 · CVE Program
- CVE-2026-107759 · NVD
- FIRST EPSS
- GHSA-jg4v-r26p-p7r2 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences