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MEDIUM severity

File Browser allows sensitive data to be transferred in URLGHSA-rmwh-g367-mj4x

MEDIUMFix: filebrowser/filebrowser@d5b39a1

GHSA-rmwh-g367-mj4x is a medium-severity (CVSS 4.5) CWE-598 vulnerability in github.com/filebrowser/filebrowser/v2. A fix is available for github.com/filebrowser/filebrowser/v2 — see the affected versions and patch details below.

Also known asCVE-2025-52901GO-2025-3794
Published
Updated
Affected
2 pkgs
Patched
1 / 2
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for GHSA-rmwh-g367-mj4x.

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk-0.06%
Lower risk than most CVEs46th percentile — riskier than 46% of all scored CVEsHighest risk
0.00%0.37%0.74%1.10%0.3%0.5%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
🐹github.com/filebrowser/filebrowser/v2🐹github.com/filebrowser/filebrowser

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

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

Affected Packages

2 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/filebrowser/filebrowser/v2all versions2.33.9go get github.com/filebrowser/filebrowser/v2@v2.33.9
🐹Gogithub.com/filebrowser/filebrowserall versionsNo fix

Affected Products

1 product · 1 configurations
Application
filebrowserfilebrowser
≤ 2.33.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/filebrowser/filebrowser/v2, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/filebrowser/filebrowser/v2 to 2.33.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-rmwh-g367-mj4x is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

## 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 info
O3 Security · Impact-Aware SCA

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File Browser allows sensitive data to be transferred in URL