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GHSA-68j5-4m99-w9w9

MediumCVSS 6.5 / 10
Published Mar 18, 2026·Last modified Apr 7, 2026
Affected Components(0)

No affected components available

Description

Summary

A permission enforcement flaw allows users without download privileges (download=false) to still expose and retrieve file content via public share links when they retain share privileges (share=true). This bypasses intended access control policy and enables unauthorized data exfiltration to unauthenticated users. Where download restrictions are used for data-loss prevention or role separation.

Details

The backend applies inconsistent authorization checks across download paths:

  • Direct raw download correctly enforces Perm.Download:
    • [raw.go](filebrowser/http/raw.go:82)
  • Share creation only enforces Perm.Share:
    • [share.go](filebrowser/http/share.go:21)
  • Public share/download handlers serve shared content without verifying owner Perm.Download:

As a result, a user who is blocked from direct downloads can create a share and obtain the same file via /api/public/dl/<hash>.

PoC

  1. Create a non-admin user with:
  • perm.share = true
  • perm.download = false
  1. Login as that user and upload a PDF file:
  • POST /api/resources/nodl_secret_<rand>.pdf with Content-Type: application/pdf
  1. Verify direct raw download is denied:
  • GET /api/raw/nodl_secret_<rand>.pdf
  • Expected and observed: 202 Accepted (blocked)
  1. Create share for same file:
  • POST /api/share/nodl_secret_<rand>.pdf
  • Observed: 200, response includes hash (example: qxfK3JMG)
  1. Download publicly without authentication:
  • GET /api/public/dl/<hash>
  • Observed (vulnerable): 200, Content-Type: application/pdf, and PDF bytes are returned

Live evidence captured (March 1, 2026):

  • create user: 201
  • create file: 200
  • direct /api/raw: 202 Accepted
  • create share: 200
  • public download /api/public/dl/mxK-ppZb: 200
  • public download content-type: application/pdf
  • public download body length: 327 bytes

Impact

This is an access control / authorization policy bypass vulnerability.

  • Who can exploit: Any authenticated user granted share=true but denied download.
  • Who is impacted: Operators and organizations relying on download restrictions to prevent data export.
  • What can happen: Restricted users can still distribute and retrieve files publicly, including unauthenticated access through share URLs.
Risk Scores
Base Score
6.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information.

Threat Intelligence
6.0

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.42%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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