What is the CVSS score of CVE-2026-5337?

CVE-2026-5337 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2026-5337?

Yes, a public proof-of-concept exploit is available for CVE-2026-5337. Prioritise patching immediately. EPSS: 0.0%.

Frontend File Manager Plugin CVE-2026-5337

EUVD-2026-26818 MEDIUM

Authorization Bypass Through User-Controlled Key (CWE-639)

2026-05-03 WPScan

WordPress Authentication Bypass Information Disclosure Frontend File Manager Plugin Unknown

6.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.5 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

PoC Detected

May 04, 2026 - 15:23 vuln.today

Public exploit code

Analysis Generated

May 04, 2026 - 14:22 vuln.today

CVSS changed

May 04, 2026 - 14:22 NVD

6.5 (MEDIUM)

EUVD ID Assigned

May 03, 2026 - 06:30 euvd

EUVD-2026-26818

Analysis Generated

May 03, 2026 - 06:30 vuln.today

CVE Published

May 03, 2026 - 06:00 nvd

MEDIUM 6.5

DescriptionCVE.org

During the analysis, it was identified that authenticated attackers with Subscriber-level access or higher are able to perform an Insecure Direct Object Reference (IDOR) attack. This vulnerability exists because the Frontend File Manager Plugin WordPress plugin through 23.6 does not properly validate user authorization for the requested uploaded file when processing download requests. By modifying the value of the 'file_id' parameter in the download endpoint (e.g., http://localhost/?do=wpfm_download&file_id=40&nm_file_nonce=a36fb893f1), an attacker can access files belonging to other users, including privileged users such as administrators. This allows unauthorized access/read to sensitive data stored within the application.

AnalysisAI

Frontend File Manager Plugin for WordPress through version 23.6 allows authenticated Subscriber-level users and higher to read arbitrary files belonging to other users via insecure direct object reference (IDOR) in the download endpoint. By manipulating the 'file_id' parameter, attackers can bypass authorization checks and access sensitive data stored by administrators and other privileged users. Publicly available exploit code exists for this vulnerability, though EPSS scoring (0.02%) suggests limited real-world exploitation relative to its high CVSS rating.

Technical ContextAI

The vulnerability resides in the Frontend File Manager Plugin's file download handler, which processes requests through the 'wpfm_download' action parameter. The root cause is CWE-639 (Authorization Bypass Through User-Controlled Key), where the plugin fails to validate that the requesting user has legitimate access to the file identified by the 'file_id' parameter before serving the download. The nonce check ('nm_file_nonce') provides CSRF protection but does not enforce per-file authorization. This is a classic IDOR flaw where sequential or enumerable identifiers are exposed in the URL without proper access control validation, allowing horizontal privilege escalation from Subscriber to access administrative files.

RemediationAI

Update Frontend File Manager Plugin to a version after 23.6 immediately. If an update is not yet available from the plugin vendor, disable the download functionality or restrict access to the 'wpfm_download' endpoint via .htaccess or web application firewall rules (e.g., deny requests to '?do=wpfm_download' for non-administrator users). WordPress administrators should verify that file permissions are correctly configured and audit recent file downloads for unauthorized access. As a temporary compensating control, restrict user registration if the site does not require open sign-ups, reducing the number of attackers capable of obtaining Subscriber credentials. Monitor access logs for enumeration patterns (sequential file_id requests) and implement per-user file access logging in the plugin settings if available.