What’s Vulnerable › Vulnerabilities

CVE-2021-4350: Frontend File Manager <= 18.2 - Unauthenticated HTML Injection leading to Spam Emails

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-06-07 · updated 2026-06-17
• Weakness: CWE-862

Description

The Frontend File Manager plugin for WordPress is vulnerable to Unauthenticated HTML Injection in versions up to, and including, 18.2. This is due to lacking authentication protections on the wpfm_send_file_in_email AJAX action. This makes it possible for unauthenticated attackers to send emails using the site with a custom subject, recipient email, and body with unsanitized HTML content. This effectively lets the attacker use the site as a spam relay.

Affected products

• nmedia Frontend File Manager Plugin: through 18.2

References

• https://blog.nintechnet.com/wordpress-frontend-file-manager-plugin-fixed-multiple-critical-vulnerabilities/
• https://www.wordfence.com/threat-intel/vulnerabilities/id/49150180-9de0-4318-b21b-779daaeb7a52?source=cve
• https://blog.nintechnet.com/wordpress-frontend-file-manager-plugin-fixed-multiple-critical-vulnerabilities/
• https://www.wordfence.com/threat-intel/vulnerabilities/id/49150180-9de0-4318-b21b-779daaeb7a52?source=cve

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