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

Quick assessment

Affected
wpmanageninja FluentSMTP – WP SMTP Plugin with Amazon SES, SendGrid, Mailgun, Postmark, Cloudflare, toSend, Gmail and Any SMTP
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress FluentSMTP是WordPress基金会开源的一款简化SMTP邮件发送配置的组件。 WordPress FluentSMTP 2.2.95及之前版本存在跨站脚本漏洞，该漏洞源于邮件日志中对收件人显示名称（to.name）的输入清理和输出转义不足，可能导致未经身份验证的攻击者注入任意Web脚本，在用户访问被注入页面时执行。

CVSS 7.2 · High EPSS 0.53% · P42

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2026-16636

Vulnerability Information
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Vulnerability Title
FluentSMTP <= 2.2.95 - Unauthenticated Stored Cross-Site Scripting via Recipient Display Name (to.name) in Email Logs
Source: CVE Program / CVE List V5
Vulnerability Description
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 sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload is delivered via an attacker-controlled recipient display name (to.name) in a wp_mail() call and does not fire in the log list view — only in the detail view when an administrator uses the Prev/Next navigation controls, as that path bypasses the escapeHtml pipeline used by the list view.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress FluentSMTP 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress FluentSMTP是WordPress基金会开源的一款简化SMTP邮件发送配置的组件。 WordPress FluentSMTP 2.2.95及之前版本存在跨站脚本漏洞，该漏洞源于邮件日志中对收件人显示名称（to.name）的输入清理和输出转义不足，可能导致未经身份验证的攻击者注入任意Web脚本，在用户访问被注入页面时执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wpmanageninja FluentSMTP – WP SMTP Plugin with Amazon SES, SendGrid, Mailgun, Postmark, Cloudflare, toSend, Gmail and Any SMTP 0 ~ 2.2.95 -

II. Public POCs for CVE-2026-16636

# POC Description Source Link Shenlong Link
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default-local-qwen3.6 · 6017 chars
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III. Intelligence Information for CVE-2026-16636

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Patches & Fixes for CVE-2026-16636 (3)

Vendor Advisories for CVE-2026-16636 (1)

Other References for CVE-2026-16636 (1)

IV. Related Vulnerabilities

Same vendor: wpmanageninja
Same weakness: CWE-79

V. Comments for CVE-2026-16636

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