FluentSMTP - WP Mail SMTP Plugin with Amazon SES, SendGrid, Mailgun, Postmark, Cloudflare, toSend, Gmail and Any SMTP vulnerabilities

Known security issues in the FluentSMTP - WP Mail SMTP Plugin with Amazon SES, SendGrid, Mailgun, Postmark, Cloudflare, toSend, Gmail and Any SMTP WordPress plugin, by affected version, with severity, CVE and the version that fixes each one.

Plugin slug: fluent-smtp
Latest version: 2.4.1
Active installs: 700,000+
Known vulnerabilities: 6
Data updated: 2026-10-17 06:31 UTC

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This information comes from public vulnerability databases and may be incomplete or out of date. A plugin with no known vulnerabilities is not proof that it is secure; keep plugins updated and remove the ones you do not use.

Fixed in version 2.3.0 (1)

FluentSMTP - WP Mail SMTP Plugin with Amazon SES, SendGrid, Mailgun, Postmark, Cloudflare, toSend, Gmail and Any SMTP: Fixed in version 2.3.0
Vulnerability	Severity	CVSS	Affected versions	Published
FluentSMTP <= 2.2.95 - Unauthenticated Stored Cross-Site Scripting via Recipient Display Name (to.name) in Email Logs CVE-2026-16636 · Source	High	7.2	< 2.3.0	2025-01-24

Fixed in version 2.2.83 (1)

FluentSMTP - WP Mail SMTP Plugin with Amazon SES, SendGrid, Mailgun, Postmark, Cloudflare, toSend, Gmail and Any SMTP: Fixed in version 2.2.83
Vulnerability	Severity	CVSS	Affected versions	Published
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 · Source	Critical	9.8	< 2.2.83	2024-11-22

Fixed in version 2.2.81 (1)

FluentSMTP - WP Mail SMTP Plugin with Amazon SES, SendGrid, Mailgun, Postmark, Cloudflare, toSend, Gmail and Any SMTP: Fixed in version 2.2.81
Vulnerability	Severity	CVSS	Affected versions	Published
WordPress FluentSMTP Plugin <= 2.2.80 is vulnerable to Cross Site Request Forgery (CSRF) CVE-2025-24739 · Source	Medium	4.3	< 2.2.81	2025-01-24

Fixed in version 2.2.5 (1)

FluentSMTP - WP Mail SMTP Plugin with Amazon SES, SendGrid, Mailgun, Postmark, Cloudflare, toSend, Gmail and Any SMTP: Fixed in version 2.2.5
Vulnerability	Severity	CVSS	Affected versions	Published
FluentSMTP <= 2.2.4 - Unauthenticated Stored Cross-Site Scripting via Email Subject CVE-2023-3087 · Source	Medium	6.1	< 2.2.5	2023-07-06

Fixed in version 2.2.3 (1)

FluentSMTP - WP Mail SMTP Plugin with Amazon SES, SendGrid, Mailgun, Postmark, Cloudflare, toSend, Gmail and Any SMTP: Fixed in version 2.2.3
Vulnerability	Severity	CVSS	Affected versions	Published
WordPress FluentSMTP Plugin < 2.2.3 is vulnerable to Cross Site Scripting (XSS) CVE-2023-0219 · Source	Medium	5.4	< 2.2.3	2023-03-03

Fixed in version 2.0.1 (1)

FluentSMTP - WP Mail SMTP Plugin with Amazon SES, SendGrid, Mailgun, Postmark, Cloudflare, toSend, Gmail and Any SMTP: Fixed in version 2.0.1
Vulnerability	Severity	CVSS	Affected versions	Published
WordPress FluentSMTP plugin <= 2.0.0 - Authenticated Stored Cross-Site Scripting (XSS) vulnerability CVE-2021-24528 · Source	Medium	5.4	< 2.0.1	2021-07-29

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Sources and attribution

Vulnerability data from WPVulnerability (WordPress, plugins, themes and server software). WPVulnerability data license.
CVE records are copyright The MITRE Corporation. CVE Terms of Use.
Known-exploited status from the CISA Known Exploited Vulnerabilities catalog. Public domain (U.S. Government work).
Plugin names, latest versions and install counts from the WordPress.org plugin directory. WordPress is a trademark of the WordPress Foundation; Webforta is not affiliated with or endorsed by WordPress.org, WPVulnerability or the sources above.