Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App 4.0.0-beta.1 - Missing Authorization to Authenticated (Subscriber+) Settings Change

6.3
Missing Authorization
CVE CVE-2026-81278
CVSS 6.3 (Medium)
Publicly Published August 26, 2026
Last Updated September 2, 2026
Researcher mad4cyber - nonprofit

Description

The Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App plugin for WordPress is vulnerable to unauthorized access due to a missing capability check on a function in version 4.0.0-beta.1. This makes it possible for authenticated attackers, with Subscriber-level access and above, to update settings.

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Vulnerability Details for Post SMTP – Complete Email Delivery 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 4.0.1, or a newer patched version
Affected Version
  • 4.0.0-beta.1
Patched Version
  • 4.0.1

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

# Title CVE ID CVSS Researchers Date
1 Post SMTP <= 4.0.1 - Unauthenticated Stored DOM-Based Cross-Site Scripting via 'user_email' Parameter (Multisite Registration → Failed Email Log) CVE-2026-75962 7.2 Adrien Brunner October 5, 2026
2 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
3 Freemius <= 2.10.1 - Reflected DOM-Based Cross-Site Scripting via url Parameter CVE-2024-13362 6.1 Asaf Mozes April 30, 2026
4 Post SMTP <= 3.8.0 - Unauthenticated Stored Cross-Site Scripting via 'event_type' CVE-2026-3090 7.2 h0xilo March 17, 2026
5 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
6 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
7 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
8 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
9 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
10 Post SMTP <= 3.1.2 - Authenticated (Administrator+) SQL Injection via columns Parameter CVE-2024-13844 4.9 Nhien Pham (nhienit) (nhienit) March 7, 2025

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