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GHSA-rmwh-g367-mj4x

MediumCVSS 4.5 / 10
Published Jun 30, 2025·Last modified Aug 4, 2025
Affected Components(0)

No affected components available

Description

Summary

URLs that are accessed by a user are commonly logged in many locations, both server- and client-side. It is thus good practice to never transmit any secret information as part of a URL. The Filebrowser violates this practice, since access tokens are used as GET parameters.

Impact

The JSON Web Token (JWT) which is used as a session identifier will get leaked to anyone having access to the URLs accessed by the user. This will give the attacker full access to the user's account and, in consequence, to all sensitive files the user has access to.

Description

Sensitive information in URLs is logged by several components (see the following examples), even if access is protected by TLS.

  • The browser history
  • The access logs on the affected web server
  • Proxy servers or reverse proxy servers
  • Third-party servers via the HTTP referrer header

In case attackers can access certain logs, they could read the included sensitive data.

Proof of Concept

When a file is downloaded via the web interface, the JWT is part of the URL:

GET /api/raw/testdir/testfile.txt?auth=eyJh[...]_r4EQ HTTP/1.1
Host: filebrowser.local:8080
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Firefox/128.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Referer: http://filebrowser.local:8080/files/testdir/
Cookie: auth=eyJh[...]_r4EQ
Upgrade-Insecure-Requests: 1
Priority: u=0, i

This also happens when a new command session is started:

GET /api/command/?auth=eyJh[...]YW8BA HTTP/1.1
Host: filebrowser.local:8080
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Firefox/128.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Sec-WebSocket-Version: 13
Origin: http://filebrowser.local:8080
Sec-WebSocket-Key: oqQMrF7R34D3lAkj1+ZHTw==
Connection: keep-alive, Upgrade
Cookie: auth=eyJh[...]YW8BA
Pragma: no-cache
Cache-Control: no-cache
Upgrade: websocket

Recommended Countermeasures

Sensitive data like session tokens or user credentials should be transmitted via HTTP headers or the HTTP body only, never in the URL.

Timeline

  • 2025-03-27 Identified the vulnerability in version 2.32.0
  • 2025-04-11 Contacted the project
  • 2025-04-29 Vulnerability disclosed to the project
  • 2025-06-25 Uploaded advisories to the project's GitHub repository
  • 2025-06-26 CVE ID assigned by GitHub
  • 2025-06-26 Fix released in version 2.33.9

References

Credits

Risk Scores
Base Score
4.5

The vulnerability can be exploited over a local network, such as Wi-Fi. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative 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
4.1

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

EPSS
0.49%

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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