weMail <= 2.0.7 - Insufficient Authorization via x-wemail-user Header to Sensitive Information Disclosure
Vulnerability Description
The weMail - Email Marketing, Lead Generation, Optin Forms, Email Newsletters, A/B Testing, and Automation plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 2.0.7. This is due to the plugin's REST API trusting the `x-wemail-user` HTTP header to identify users without verifying the request originates from an authenticated WordPress session. This makes it possible for unauthenticated attackers who know or can guess an admin email (easily enumerable via `/wp-json/wp/v2/users`) to impersonate that user and access the CSV subscriber endpoints, potentially exfiltrating subscriber PII (emails, names, phone numbers) from imported CSV files.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- Angus Girvan
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/59c0caa2-d0c2-472e-83c3-d11ad313720d?source=cve
- https://plugins.trac.wordpress.org/browser/wemail/tags/2.0.6/includes/Rest/Csv.php#L79
- https://plugins.trac.wordpress.org/browser/wemail/tags/2.0.6/includes/Rest/Csv.php#L85
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3442404%40wemail%2Ftrunk&old=3423372%40wemail%2Ftrunk&sfp_email=&sfph_mail=#file1
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