CVE-2021-4369: Frontend File Manager <= 18.2 - Unauthenticated Content Injection

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% 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 Content Injection in versions up to, and including, 18.2. This is due to lacking authorization protections, checks against users editing other's posts, and lacking a security nonce, all on the wpfm_edit_file_title_desc AJAX action. This makes it possible for unauthenticated attackers to edit the content and title of every page on the site.

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://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2554359%40nmedia-user-file-uploader&new=2554359%40nmedia-user-file-uploader&sfp_email=&sfph_mail=
https://www.wordfence.com/threat-intel/vulnerabilities/id/c434e6b8-0dd5-4ffe-93b1-1af614c08f85?source=cve
https://blog.nintechnet.com/wordpress-frontend-file-manager-plugin-fixed-multiple-critical-vulnerabilities/
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2554359%40nmedia-user-file-uploader&new=2554359%40nmedia-user-file-uploader&sfp_email=&sfph_mail=
https://www.wordfence.com/threat-intel/vulnerabilities/id/c434e6b8-0dd5-4ffe-93b1-1af614c08f85?source=cve

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