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🛡️ CVE-2026-32761 — filebrowser

🟡 CVSS 6.5 — Medium ⚠️ Exploit Public CWE-284 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

File Browser has an Authorization Policy Bypass in Public Share Download Flow

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](https://github.com/filebrowser/filebrowser/blob/master/http/raw.go#82)](filebrowser/http/raw.go:82)
  • Share creation only enforces Perm.Share:
  • [[share.go](https://github.com/filebrowser/filebrowser/blob/master/http/share.go#21)](filebrowser/http/share.go:21)
  • Public share/download handlers serve shared content without verifying owner Perm.Download:
  • [public.go](https://github.com/filebrowser/filebrowser/blob/master/http/public.go#18)(filebrowser/http/public.go:18)
  • [public.go](https://github.com/filebrowser/filebrowser/blob/master/http/public.go#116)(filebrowser/http/public.go:116)

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

2. Login as that user and upload a PDF file:

  • POST /api/resources/nodl_secret_<rand>.pdf with Content-Type: application/pdf

3. Verify direct raw download is denied:

  • GET /api/raw/nodl_secret_<rand>.pdf
  • Expected and observed: 202 Accepted (blocked)

4. Create share for same file:

  • POST /api/share/nodl_secret_<rand>.pdf
  • Observed: 200, response includes hash (example: qxfK3JMG)

5. 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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: None.
  • Availability impact: None.

Weakness class

CVE-2026-32761 is classified as CWE-284: Improper Access Control. The software does not restrict an action to the actors that should be allowed to perform it.

Affected software

CVE-2026-32761 is recorded against 4 packages.

  • filebrowser (fixed in 2.62.0)
  • github.com/filebrowser/filebrowser
  • github.com/filebrowser/filebrowser/v2
  • https://github.com/filebrowser/filebrowser

Timeline and source

Published on 20 March 2026 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
github.com
github.com

Other advisories for this package

filebrowser has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-284: Improper Access Control) in other software:

Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE CWE-284
Public Exploit ⚠️ Yes
Source NVD
Published 2026-03-20
Updated 2026-08-20
Modified 2026-06-17

Affected Packages

Software From version Fixed in
filebrowser — 2.62.0
github.com/filebrowser/filebrowser — —
github.com/filebrowser/filebrowser/v2 — —
https://github.com/filebrowser/filebrowser — —

Similar Threats

Exploit Protection

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