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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
wpo365:wpo365 | microsoft 365 graph mailer
References 7
https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Core/S…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Mail/M…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Servic…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/Servic…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/wpo365-msgraphmailer/tags/6.1/apps/d…
security@wordfence.com
https://plugins.trac.wordpress.org/changeset?reponame=&old=3752919%40wpo365-msg…
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/d51ba0c2-588d-4241-97…
security@wordfence.com