CVE-2021-4350Public exploitNetwork attack vector

Spam relay via unauthenticated HTML email action

Published Jun 7, 2023 · Updated Apr 8, 2026

Missing authorization in N-Media Frontend File Manager Plugin 18.2 and earlier allows remote attackers to send arbitrary HTML email. The unauthenticated wpfm_send_file_in_email AJAX action copies attacker-controlled recipient, subject, and message fields into an HTML email and calls the send routine without authorization or sanitization. No WordPress account or valid file identifier is required, allowing any network-reachable attacker to use the site as a spam relay.

CVSS severity7.2
High
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in N-Media Frontend File Manager Plugin 18.2 and earlier allows remote attackers to send arbitrary HTML email. The unauthenticated wpfm_send_file_in_email AJAX action copies attacker-controlled recipient, subject, and message fields into an HTML email and calls the send routine without authorization or sanitization. No WordPress account or valid file identifier is required, allowing any network-reachable attacker to use the site as a spam relay.

The record

CVE
CVE-2021-4350
Published
Jun 7, 2023
Updated
Apr 8, 2026
Vendor
N-Media
Product
Frontend File Manager Plugin
Classifications
CWE-862, T1496
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <18.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

N-Media · Frontend File Manager Pluginversion=0 <18.3

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
7.2WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1496Resource Hijacking

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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