Stored Cross-Site Scripting Vulnerability in Post SMTP Email Plugin for WordPress
CVE-2026-3090

7.2HIGH

Key Information:

Vendor

WordPress
Status
Post Smtp – Complete Email Deliverability And Smtp Solution With Email Logs, Alerts, Backup Smtp & Mobile App
Vendor
CVE Published:
18 March 2026

What is CVE-2026-3090?

The Post SMTP plugin for WordPress is susceptible to a Stored Cross-Site Scripting (XSS) vulnerability through the 'event_type' parameter. This weakness arises from inadequate input sanitization and output escaping in versions up to and including 3.8.0. An unauthenticated attacker can exploit this flaw, injecting malicious scripts that execute when users access compromised pages. This vulnerability becomes particularly critical when the Post SMTP Pro plugin is installed and its Reporting and Tracking extension is active, facilitating the execution of harmful scripts.

Affected Version(s)

Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App 0 <= 3.8.0

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/post-smtp/trun...
https://plugins.trac.wordpress.org/changeset/3484515/

CVSS V3.1

Score:
7.2
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Phú
.