9.8

CVE-2021-4356: najeebmedia frontend_file_manager_plugin Missing Authorization

CVSS: 9.8v3.1CriticalModified
Published 07-06-2023Last modified 08-04-2026
Open JSON

Vulnerability summary

CVE-2021-4356 is a critical (CVSS 9.8) Missing Authorization vulnerability in najeebmedia frontend_file_manager_plugin. EPSS estimates a 1.52% chance of exploitation in the next 30 days, higher than 74.1% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
1.52%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 07-06-2023
    PublishedVulnerability first disclosed.
  2. 08-04-2026
    Last modifiedVulnerability information updated.

Description

The Frontend File Manager plugin for WordPress is vulnerable to Unauthenticated Arbitrary File Download in versions up to, and including, 18.2. This is due to lacking authentication protections, capability checks, and sanitization, all on the wpfm_file_meta_update AJAX action. This makes it possible for unauthenticated attackers to download arbitrary files on the site, potentially leading to site takeover.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

1.52%

Chance of exploitation in the next 30 days

Percentile

74%

Versus all other CVEs

30-day change

0.00 pp

From 1.52% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.52%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (blog.nintechnet.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Najeebmedia1 product
Nmedia1 product
Wordpress1 product
  • nmedia-user-file-uploader< 18.3

3 vendors · 3 products

References

4 links