Is this vulnerability remotely exploitable?

Yes. Any remote user who can authenticate to the Directus instance and has basic file upload permissions can attempt to exploit the /files/tus endpoint over the network.

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

The attacker must have a valid Directus account with permission to upload or update files at the collection level. They do not need explicit permission on the specific file they are overwriting, which is the core of the issue.

What is the safest general fix pattern for this kind of bug?

The safest approach is to centralize authorization in shared functions or middleware and require that all file-modifying endpoints—including alternative protocols like TUS—invoke item-level permission checks using the same logic as the main REST API. Avoid implementing parallel, ad-hoc permission checks per endpoint.

Severity:

HIGH RISK

(7.1)

Missing Authorization Checks (CWE-863) in Directus TUS Resumable Upload Endpoint

CVE-2026-35412

Published:

Apr 6, 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

HIGH RISK

HIGH

(7.3)

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

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

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

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Broken Access Control

CWE:

CWE-863

Impact:

Unauthorized File Overwrite and Privilege Bypass

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Broken Access Control

CWE:

CWE-863

Impact:

Unauthorized File Overwrite and Privilege Bypass

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

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355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Missing Authorization Checks (CWE-863) in Directus TUS Resumable Upload 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

HIGH RISK

HIGH

(7.3)

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

HIGH RISK

HIGH

(7.3)

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

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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