EUVD-2026-12841
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Lifecycle Timeline
3Description
The Post SMTP - Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘event_type’ parameter in all versions up to, and including, 3.8.0 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 vulnerability is only exploitable when the Post SMTP Pro plugin is also installed and its Reporting and Tracking extension is enabled.
Analysis
A stored cross-site scripting (XSS) vulnerability exists in the Post SMTP WordPress plugin through version 3.8.0, allowing unauthenticated attackers to inject malicious scripts via the 'event_type' parameter. The vulnerability requires the Post SMTP Pro plugin with its Reporting and Tracking extension to be enabled for exploitation. …
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Remediation
Within 24 hours: audit all WordPress installations for Post SMTP plugin presence and Pro version status; document affected sites and take inventory of exposed data. Within 7 days: implement WAF rules blocking malicious payloads to the 'event_type' parameter; disable Post SMTP Reporting and Tracking extension on all affected sites if operationally feasible. …
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External POC / Exploit Code
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