CVE-2021-4365Public exploitNetwork attack vector

Administrator-session script execution via context-mismatched escaping

Published Jun 7, 2023 · Updated Apr 8, 2026

Stored cross-site scripting in N-Media Frontend File Manager Plugin 18.2 and earlier allows remote attackers to run script in an administrator's browser. The unauthenticated wpfm_edit_file_title_desc AJAX handler stores file_title after applying esc_attr, then renders it outside an HTML attribute in the admin interface. A victim must visit the plugin settings page, where the stored script can act with that browser session's privileges.

CVSS severity6.1
Medium
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in N-Media Frontend File Manager Plugin 18.2 and earlier allows remote attackers to run script in an administrator's browser. The unauthenticated wpfm_edit_file_title_desc AJAX handler stores file_title after applying esc_attr, then renders it outside an HTML attribute in the admin interface. A victim must visit the plugin settings page, where the stored script can act with that browser session's privileges.

The record

CVE
CVE-2021-4365
Published
Jun 7, 2023
Updated
Apr 8, 2026
Vendor
N-Media
Product
Frontend File Manager Plugin
Classifications
CWE-79, T1189
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

7.2WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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