CVE-2026-96768: GoSMTP Pro <= 1.2.3 - Unauthenticated Stored Cross-Site Scripting via Comment Content via Email Log Body
The GoSMTP Pro plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content via Email Log Body in all versions up to, and including, 1.2.3 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 exploit is made possible because WordPress comment kses does not strip entity-encoded tag delimiters, allowing the payload to pass moderation as safe text before being decoded into live HTML by core email notification functions and written verbatim into the plugin's email log database table.
Affected Software
Event History
Frequently Asked Questions
Who can exploit this issue?
An unauthenticated attacker can exploit it remotely with no user interaction required to submit the malicious content. The script executes later when a user accesses the injected page or log entry.
What condition makes exploitation possible?
The attack relies on WordPress comment processing allowing entity-encoded tag delimiters through moderation. Core email notification processing then decodes the content into HTML, and GoSMTP Pro stores it verbatim in its email log database table.
Are default deployments affected?
The provided information identifies affected GoSMTP Pro versions through 1.2.3, but does not state whether email logging or the relevant comment and notification behavior must be explicitly enabled.
How can I determine whether my site may be affected?
Check whether GoSMTP Pro version 1.2.3 or earlier is installed and review its email log records for suspicious comment content, especially entity-encoded HTML tag delimiters or unexpected script-like markup.