CVE-2026-39942Network attack vector

Authenticated file overwrite via user-controlled storage path

Published Apr 9, 2026 · Updated Apr 9, 2026

Broken access control in Directus before 11.17.0 allows remote authenticated users to overwrite other users' files through the API. The PATCH /files/{id} handler accepts a user-controlled filename_disk value and resolves it to an existing storage path without enforcing path ownership. A low-privileged account with file-update access can replace legitimate content and alter attribution metadata; code execution additionally requires storage shared with the extensions directory.

CVSS severity8.5
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Broken access control in Directus before 11.17.0 allows remote authenticated users to overwrite other users' files through the API. The PATCH /files/{id} handler accepts a user-controlled filename_disk value and resolves it to an existing storage path without enforcing path ownership. A low-privileged account with file-update access can replace legitimate content and alter attribution metadata; code execution additionally requires storage shared with the extensions directory.

The record

CVE
CVE-2026-39942
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
Directus
Product
Directus
Classifications
CWE-639, CWE-284, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 11.17.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Directus · Directusversion=< 11.17.0

Published CVSS scores

8.5GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
CWE-284Improper Access Control
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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