Advisory details:
github_osv / GHSA-393c-p46r-7c95
| Advisory ID | github_osv/GHSA-393c-p46r-7c95 |
| Aliases |
CVE-2026-39942
|
| Summary | Directus: Path Traversal and Broken Access Control in File Management API ## Summary A broken access control vulnerability was identified in the Directus file management API that allows authenticated users to overwrite files belonging to other users by manipulating the `filename_disk` parameter. ## Details The `PATCH /files/{id}` endpoint accepts a user-controlled `filename_disk` parameter. By setting this value to match the storage path of another user's file, an attacker can overwrite that file's content while manipulating metadata fields such as `uploaded_by` to obscure the tampering. ## Impact - **Unauthorized File Overwrite**: Attackers can replace legitimate files with malicious content, creating significant risk of malware propagation and data corruption. - **Remote Code Execution**: If the storage backend is shared with the extensions location, attackers can deploy malicious extensions that execute arbitrary code when loaded. - **Data Integrity Compromise**: Files can be tampered with or replaced without visible indication in the application interface. ## Mitigation The `filename_disk` parameter should be treated as a server-controlled value. Uniqueness of storage paths must be enforced server-side, and `filename_disk` should be excluded from the fields users are permitted to update directly. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 7.7 |
| Risk | 3.9 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 8.5 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-393c-p46r-7c95/GHSA-393c-p46r-7c95.json |
| generic_textual | HIGH |
| Reference id | Reference type | URL |
|---|---|---|
| https://github.com/directus/directus | ||
| https://github.com/directus/directus/security/advisories/GHSA-393c-p46r-7c95 | ||
| CVE-2026-39942 | https://nvd.nist.gov/vuln/detail/CVE-2026-39942 | |
| v11.17.0 | Other | https://github.com/directus/directus/releases/tag/v11.17.0 |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-09T17:47:33Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/39xxx/CVE-2026-39942.json
Source Advisory: vulnrichment/CVE-2026-39942
[{'Exploitation': 'none'},
{'Automatable': 'no'},
{'Technical Impact': 'partial'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]