CVE-2026-16636
HighCVSS 7.2Exploitation Probability (EPSS)
Low risk23th percentile - higher than 23% of all known CVEs
Summary
The FluentSMTP plugin for WordPress up to version 2.2.95 is vulnerable to Stored Cross-Site Scripting via Recipient Display Name (to.name) in Email Logs due to insufficient input sanitization and output escaping. This allows unauthenticated attackers to inject arbitrary web scripts that execute when an administrator accesses the detail view of logs.
Risk Assessment
An attacker can inject malicious scripts that execute in the administrator's browser when viewing email logs, potentially leading to session theft or account takeover.
Recommendation
Update the FluentSMTP plugin to a patched version. Restrict access to email logs to trusted administrators only.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS