Plugin vulnerabilities
Is FluentSMTP safe? Known vulnerabilities and the version to run.
FluentSMTP: sends WordPress email through a proper mail service such as Amazon SES, Gmail or Mailgun.
The short answer
Run FluentSMTP 2.3.0 or later. That version has a fix for every known vulnerability that's been patched.
- Known vulnerabilities
- 6
- In the last 12 months
- 1
- Rated high or critical
- 3
- No fix yet
- 0
Every known FluentSMTP vulnerability
Newest first. The most recent was disclosed on 5 August 2026. Each one links to its full record on Wordfence.
| Vulnerability | Severity | Affected versions | Fixed in |
|---|---|---|---|
| Unauthenticated Stored Cross-Site Scripting via Recipient Display Name (to.name) in Email LogsCVE-2026-16636 · 5 August 2026 | High 7.2 | 2.2.95 and earlier | 2.3.0 |
| Cross-Site Request ForgeryCVE-2025-24739 · 24 January 2025 | Medium 4.3 | 2.2.80 and earlier | 2.2.81 |
| Unauthenticated PHP Object InjectionCVE-2024-9511 · 22 November 2024 | Critical 9.8 | 2.2.82 and earlier | 2.2.83 |
| Unauthenticated Stored Cross-Site Scripting via Email SubjectCVE-2023-3087 · 6 July 2023 | High 7.2 | 2.2.4 and earlier | 2.2.5 |
| Authenticated (Author+) Stored Cross-Site Scripting via Email LogsCVE-2023-0219 · 3 March 2023 | Low 3.8 | 2.2.2 and earlier | 2.2.3 |
| Authenticated (Admin+) Stored Cross-Site ScriptingCVE-2021-24528 · 29 July 2021 | Medium 5.5 | before 2.0.1 | 2.0.1 |
If you run FluentSMTP
What to do now
- Check your version. In WordPress, go to Plugins and look under FluentSMTP. Compare it with the affected versions above.
- Update to 2.3.0 or later. Take a backup first, then update. If the update breaks something, you can restore the backup while you work out why.
- Check the rest of your site. One outdated plugin is rarely the only one. Our free security check looks at your WordPress version, and the plugins and theme it can see from the outside, for known flaws and emails you a report.
Pressfort keeps your plugins up to date for you, testing each update on a copy of your site first, and its virtual patching blocks attacks on newly disclosed flaws, often before a fix is out. If your site does get hacked, two clean-ups a year are included, with a developer stepping in when needed. See how it works.
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Data sources and licences
Vulnerability data comes from Wordfence Intelligence and is refreshed daily. Severity is the CVSS score given in each record. Pressfort is not affiliated with Wordfence or Defiant Inc.
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