CVE-2021-4350 - CVE House

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Status published High CVE-2021-4350

Frontend File Manager <= 18.2 - Unauthenticated HTML Injection leading to Spam Emails

7.2 CVSS

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Jerome Bruandet

References

More from nmedia

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Simple User Registration <= 6.3 - Unauthenticated Privilege Escalation

Admin and Customer Messages After Order for WooCommerce: OrderConvo <= 14 - Missing Authorization to Unauthenticated User Impersonation in Order Messages

Admin and Customer Messages After Order for WooCommerce: OrderConvo <= 14 - Missing Authorization to Unauthenticated Information Disclosure

Frontend File Manager Plugin <= 23.4 - Insecure Direct Object Reference to Authenticated (Subscriber+) Arbitrary File Renaming

Simple User Registration <= 6.6 - Unauthenticated Stored Cross-Site Scripting

Affected Vendor

nmedia

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Affected Software

Frontend File Manager Plugin

Vulnerable Versions:

0

Timeline

Official Publish: June 7th, 2023

Last Modified: April 8th, 2026

Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application

T1068 Exploitation for Privilege Escalation

Privilege Escalation

T1078 Valid Accounts

T1531 Account Access Removal