CVE-2026-16636

The FluentSMTP – WP SMTP Plugin with Amazon SES, SendGrid, MailGun, Postmark, Google and Any SMTP Provider plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Recipient Display Name to.name in Email Logs in all versions up to, and including, 2.2.95 due to insufficient input...

CVE-2026-16636 FluentSMTP <= 2.2.95 - Unauthenticated Stored Cross-Site Scripting via Recipient Display Name (to.name) in Email Logs

The FluentSMTP – WP SMTP Plugin with Amazon SES, SendGrid, MailGun, Postmark, Google and Any SMTP Provider plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Recipient Display Name to.name in Email Logs in all versions up to, and including, 2.2.95 due to insufficient input...

CVE-2026-16636

The CVE concerns FluentSMTP

Nextcloud: SMTP header injection via C-escape `\r` in the recipient display name

A vulnerability was discovered in Roundcube's email handling where authenticated users could inject arbitrary SMTP headers through the recipient display name field. The issue occurred because the application stripped carriage return and line feed characters before applying a function that convert...