FluentSMTP <= 2.0.0 - Authenticated (Admin+) Stored Cross-Site Scripting

5.5
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2021-24528
CVSS 5.5 (Medium)
Publicly Published July 29, 2021
Last Updated December 5, 2022
Researcher YoshiKen

Description

The FluentSMTP WordPress plugin before 2.0.1 does not sanitize parameters before storing the settings in the database, nor does the plugin escape the values before outputting them when viewing the SMTP settings set by this plugin, leading to a stored cross site scripting (XSS) vulnerability. Only users with roles capable of managing plugins can modify the plugin's settings.

Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.

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Vulnerability Details for FluentSMTP – WP SMTP Plugin with Amazon SES, SendGrid, Mailgun, Postmark, Cloudflare, toSend, Gmail and Any SMTP

Software Type Plugin
Software Slug fluent-smtp (view on wordpress.org)
Patched? Yes
Remediation Update to version 2.0.1, or a newer patched version
Affected Version
  • < 2.0.1
Patched Version
  • 2.0.1

Recent vulnerabilities in FluentSMTP – WP SMTP Plugin with Amazon SES, SendGrid, Mailgun, Postmark, Cloudflare, toSend, Gmail and Any SMTP

# Title CVE ID CVSS Researchers Date
1 FluentSMTP <= 2.2.95 - Unauthenticated Stored Cross-Site Scripting via Recipient Display Name (to.name) in Email Logs CVE-2026-16636 7.2 Fraudless August 5, 2026
2 FluentSMTP <= 2.2.80 - Cross-Site Request Forgery CVE-2025-24739 4.3 Rafie Muhammad January 24, 2025
3 FluentSMTP – WP SMTP Plugin with Amazon SES, SendGrid, MailGun, Postmark, Google and Any SMTP Provider <= 2.2.82 - Unauthenticated PHP Object Injection CVE-2024-9511 9.8 Leo November 22, 2024
4 FluentSMTP <= 2.2.4 - Unauthenticated Stored Cross-Site Scripting via Email Subject CVE-2023-3087 7.2 Alex Thomas July 6, 2023
5 FluentSMTP <= 2.2.2 - Authenticated (Author+) Stored Cross-Site Scripting via Email Logs CVE-2023-0219 3.8 Vaibhav Rajput March 3, 2023

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