POST SMTP Mailer <= 2.8.6 - Reflected Cross-Site Scripting via msg

6.1
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2023-6629
CVSS 6.1 (Medium)
Publicly Published January 2, 2024
Last Updated March 20, 2024
Researcher Matan Berson (matanber)

Description

The POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the ‘msg’ parameter in all versions up to, and including, 2.8.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. CVE-2023-6621 appears to be a duplicate of this issue. CVE-2024-29128 appears to be a duplicate of this issue.

Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.

References

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Vulnerability Details for Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App

Software Type Plugin
Software Slug post-smtp (view on wordpress.org)
Patched? Yes
Remediation Update to version 2.8.7, or a newer patched version
Affected Version
  • <= 2.8.6
Patched Version
  • 2.8.7

Recent vulnerabilities in Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App

# Title CVE ID CVSS Researchers Date
1 Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App <= 3.6.2 - Unauthenticated Stored Cross-Site Scripting CVE-2026-48838 7.2 Drew Webber (mcdruid) May 28, 2026
2 Freemius <= 2.10.1 - Reflected DOM-Based Cross-Site Scripting via url Parameter CVE-2024-13362 6.1 Asaf Mozes April 30, 2026
3 Post SMTP <= 3.8.0 - Unauthenticated Stored Cross-Site Scripting via 'event_type' CVE-2026-3090 7.2 h0xilo March 17, 2026
4 Post SMTP <= 3.8.0 - Missing Authorization to Authenticated (Subscriber+) Office 365 OAuth Configuration Overwrite CVE-2026-2559 5.3 Michael Iden (Mickhat) March 17, 2026
5 Post SMTP – Complete SMTP Solution with Logs, Alerts, Backup SMTP & Mobile App <= 3.6.1 - Missing Authorization to Authenticated (Subscriber+) OAuth Token Update CVE-2025-12887 5.4 type5afe December 3, 2025
6 Post SMTP – Complete SMTP Solution with Logs, Alerts, Backup SMTP & Mobile App <= 3.6.0 - Missing Authorization to Account Takeover via Unauthenticated Email Log Disclosure CVE-2025-11833 9.8 netranger October 31, 2025
7 Post SMTP <= 3.4.1 - Missing Authorization to Authenticated (Subscriber+) Limited Plugin Option Update CVE-2025-9219 4.3 Matteo Leonelli, David D. September 2, 2025
8 Post SMTP <= 3.2.0 - Missing Authorization to Authenticated (Subscriber+) Account Takeover via Email Log Exposure CVE-2025-24000 8.8 Denver Jackson July 21, 2025
9 Post SMTP <= 3.1.2 - Authenticated (Administrator+) SQL Injection via columns Parameter CVE-2024-13844 4.9 Nhien Pham (nhienit) March 7, 2025
10 Post SMTP <= 3.0.2 - Unauthenticated Stored Cross-Site Scripting CVE-2025-0521 7.2 zer0gh0st February 17, 2025

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