CVE-2026-3090CWE-79

Post SMTP <= 3.8.0 - Unauthenticated Stored Cross-Site Scripting via 'event_type'

High · published March 18, 2026

CVSS v3.1
7.2
EPSS
0%
Percentile
33.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00408 · 33.9th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-03-18T15:28Z
EPSS history
Timeline
  • 18 MAR 15:28Z
    Post SMTP <= 3.8.0 - Unauthenticated Stored Cross-Site Scripting via 'event_type'
    cvelistv5