Is this vulnerability remotely exploitable?

Yes. Any remote caller with the ability to reach the Directus API and perform `PATCH /files/{id}` on at least one file can potentially exploit this, assuming other environmental protections (like network segmentation) do not block access.

What level of access does an attacker need to exploit this issue?

The attacker typically needs authenticated access with permission to update file records. They do not need direct access to the underlying storage system; the exploit is carried out through the legitimate API.

What is the safest general fix pattern for developers?

The strongest fix is to remove client control over internal storage identifiers such as `filename_disk`, and ensure that all storage paths are generated and managed solely on the server. Any change that can affect where or how a file is stored should be tightly coupled to ownership checks and server-side logic.

Severity:

HIGH RISK

(8.5)

Improper Access Control (CWE-284) in Directus File PATCH Endpoint

CVE-2026-39942

Published:

Apr 9, 2026

Status:

Received

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI Handler setAccessDeviceCfg

Remote Code Execution on the Router

April 12, 2026

CWE-77;CWE-78

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI setLedCfg Handler

Remote Code Execution on the Router

April 12, 2026

Vulnerability Type

Category:

Improper Access Control

CWE:

CWE-284;CWE-639

Impact:

Unauthorized File Overwrite and Data Tampering

Severity:

HIGH RISK

(8.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper Access Control

CWE:

CWE-284;CWE-639

Impact:

Unauthorized File Overwrite and Data Tampering

Severity:

HIGH RISK

(8.5)

CVSS Version:

3.1

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Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Improper Access Control (CWE-284) in Directus File PATCH Endpoint

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI Handler setAccessDeviceCfg

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI setLedCfg Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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