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

Free WP Mail SMTP plugin - fix WordPress email deliverability with Gmail, Amazon SES, SendGrid, Mailgun, Cloudflare, Postmark, Brevo and any SMTP.

4Reported vulnerabilities

9.8Highest CVSS score

2.3.1Latest version

600,000+Active installs

What to do now

Update FluentSMTP – WP SMTP Plugin with Amazon SES, SendGrid, Mailgun, Postmark, Cloudflare, toSend, Gmail and Any SMTP to 2.3.0 or later. 4 of these have a fixed version available. Updating resolves them.

Plugin last updated: August 12, 2026 / Tested up to WordPress: 7.0.4 / View on wordpress.org

Reported vulnerabilities

Ordered by how urgently they need attention — whether a vulnerability is actually being exploited, and how likely exploitation is, rather than CVSS severity alone.

CVE	Severity	Exploit probability next 30 days	Affected versions	Fixed in	Published
CVE-2024-9511	Critical 9.8	1.2%	0 to 2.2.82 (inclusive) 0 to 2.2.82 (inclusive)	`2.2.83`	November 23, 2024
CVE-2026-16636	High 7.2	0.3%	0 to 2.2.95 (inclusive)	`2.3.0`	August 6, 2026
CVE-2023-3087	Medium 6.1	0.6%	Before 2.2.5	`2.2.5`	July 12, 2023
CVE-2025-24739	Medium 4.3	0.2%	2.2.80 and earlier	`2.2.81`	January 24, 2025

Sources: vulnerability records from NVD, exploitation from CISA KEV, exploit probability from EPSS. Affected versions come from CPE ranges or from the reporting CNA.