CVE-2025-57921: 
WordPress vulnerability analysis and mitigation

CVE-2025-57921 is a Missing Authorization (Broken Access Control) vulnerability in the N-Media Frontend File Manager WordPress plugin (nmedia-user-file-uploader). It affects all versions up to and including 23.3, and was disclosed on September 22, 2025. The flaw allows unauthenticated network-based attackers to exploit incorrectly configured access control security levels. It carries a CVSS v3.1 base score of 5.3 (Medium) (Patchstack).

The root cause is classified as CWE-862 (Missing Authorization), meaning one or more plugin functions fail to perform adequate authorization checks before executing privileged or sensitive operations. An unauthenticated remote attacker can send crafted network requests to trigger these unprotected functions, effectively bypassing access controls without requiring any credentials or user interaction. The vulnerability was discovered and reported by researcher Hiro (Code016Hiro) on July 11, 2025, and published by Patchstack on September 22, 2025 (Patchstack).

Successful exploitation results in a low integrity impact — an unauthenticated attacker may be able to perform actions or access functionality that should be restricted to higher-privileged users, without any confidentiality or availability impact. The scope is limited to the affected WordPress installation, but given the plugin's file management functionality, unauthorized file operations (such as uploads or modifications) could potentially be triggered. Patchstack notes that vulnerabilities of this class are commonly used in mass-exploit campaigns targeting large numbers of WordPress sites regardless of their size or popularity (Patchstack).

No public proof-of-concept exploit code or active in-the-wild exploitation has been reported for this vulnerability. The EPSS score is approximately 0.037%, indicating a low probability of exploitation in the near term. It is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Patchstack classifies this as low priority with unlikely exploitation impact (Patchstack).

The vendor has released version 23.4 of the Frontend File Manager plugin, which resolves this vulnerability. Site administrators should update the plugin to version 23.4 or later immediately via the WordPress admin dashboard or their hosting provider. Patchstack users can enable auto-update for vulnerable plugins as an additional safeguard (Patchstack).