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Missing Authorization check in the Post SMTP plugin for WordPress 

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: CRITICAL

Software Affected

WordPress Plugin Post SMTP versions 3.6.0 and prior

Overview

A vulnerability has been reported in the Post SMTP plugin for WordPress, which could allow an unauthenticated attacker to access sensitive information on the targeted system.

Target Audience:

Users of affected WordPress Plugins.

Risk Assessment:

High risk of unauthorised access.

Impact Assessment:

Potential for account takeover.

Description

Post SMTP is a WordPress plugin that ensures reliable email delivery by using proper SMTP authentication, offering detailed logs, delivery alerts, backup SMTP options, and mobile app notifications.

The vulnerability in the Post SMTP plugin for WordPress exists due to a missing authorisation check on the construct function.

Successful exploitation of this vulnerability could allow an unauthenticated attacker, which could allow an unauthenticated attacker to access sensitive information on the targeted system.

Solution

Apply appropriate updates as mentioned:

https://www.wordfence.com/threat-intel/vulnerabilities/wordpress-plugins/post-smtp/post-smtp-complete-smtp-solution-with-logs-alerts-backup-smtp-mobile-app-360-missing-authorization-to-account-takeover-via-unauthenticated-email-log-disclosure

Vendor Information

Post SMTP

https://wordpress.org/plugins/post-smtp/

References

WordFence

https://www.wordfence.com/threat-intel/vulnerabilities/wordpress-plugins/post-smtp/post-smtp-complete-smtp-solution-with-logs-alerts-backup-smtp-mobile-app-360-missing-authorization-to-account-takeover-via-unauthenticated-email-log-disclosure

CVE Name

CVE-2025-11833

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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