What the vulnerability does
01Description
The FluentSMTP – WP SMTP Plugin with Amazon SES, SendGrid, MailGun, Postmark, Google and Any SMTP Provider plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 2.2.82 via deserialization of untrusted input in the 'formatResult' function. This makes it possible for unauthenticated attackers to inject a PHP Object. No known POP chain is present in the vulnerable software. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code. The vulnerability was partially patched in version 2.2.82.
Explanation of Vulnerability in Simple Terms
02Summary
FluentSMTP versions up to 2.2.82 contain a deserialization vulnerability that allows unauthenticated attackers to run arbitrary PHP code on the site. The plugin unsafely deserializes untrusted data, enabling remote code execution without authentication or user interaction. All sites running affected versions should update immediately.
What an attacker can do
03Attacker Capabilities
Run arbitrary PHP code on the site and take full control of it.
Potential impact on your site
04Site Impact
Complete site compromise. An attacker can steal data, modify content, install malware, or take the site offline.
Conditions required to exploit
05Prerequisites
None. The attacker needs only network access; no authentication or user interaction required.
Key dates
06Disclosure timeline
November 23, 2024
CVE published
April 8, 2026
Record updated
