Is CVE-2026-44542 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-44542 being exploited in the wild.

How severe is CVE-2026-44542?

Critical severity, with a CVSS score of 9.1, published 14 May 2026.

Which products and versions are affected?

Filebrowser < 0.0.0-20260501183844-112740bdd41d; github.com/gtsteffaniak/filebrowser (Go) < 0.0.0-20260501183844-112740bdd41d, SEMVER:introduced=0,fixed=0.0.0-20260501183844-112740bdd41d; Gtsteffaniak FileBrowser Quantum < 1.3.1-stable, < 1.3.9-beta.

Is there a fix for CVE-2026-44542?

Yes. github.com/gtsteffaniak/filebrowser (Go): upgrade to 0.0.0-20260501183844-112740bdd41d or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-44542 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-44542?

Check whether you run Filebrowser, github.com/gtsteffaniak/filebrowser (Go) or Gtsteffaniak FileBrowser Quantum at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-44542: gtsteffaniak FileBrowser Quantum path traversal in public share delete

Q: Which products and versions are affected?

Filebrowser < 0.0.0-20260501183844-112740bdd41d; github.com/gtsteffaniak/filebrowser (Go) < 0.0.0-20260501183844-112740bdd41d, SEMVER:introduced=0,fixed=0.0.0-20260501183844-112740bdd41d; Gtsteffaniak FileBrowser Quantum < 1.3.1-stable, < 1.3.9-beta.

Q: Is there a fix for CVE-2026-44542?

Yes. github.com/gtsteffaniak/filebrowser (Go): upgrade to 0.0.0-20260501183844-112740bdd41d or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-44542 attacked?

It is attacked over the network, in a network appliance.

Q: Am I affected by CVE-2026-44542?

Check whether you run Filebrowser, github.com/gtsteffaniak/filebrowser (Go) or Gtsteffaniak FileBrowser Quantum at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-44542 · Severity: critical · CVSS 9.1 · Published 2026-05-14

FileBrowser Quantum is a self-hosted web application used for managing and sharing files. A security flaw allows unauthorized individuals who have access to a public file-sharing link (with delete permissions enabled) to delete files they should not have access to. By manipulating the web request, an attacker can bypass folder restrictions and delete any file within the storage area of the person who created the share, potentially leading to significant data loss.

Technologies: Filebrowser, github.com/gtsteffaniak/filebrowser (Go), Gtsteffaniak FileBrowser Quantum. Vendors: FileBrowser, Go, Gtsteffaniak.

Quick answers

Is CVE-2026-44542 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-44542 being exploited in the wild.
How severe is CVE-2026-44542?: Critical severity, with a CVSS score of 9.1, published 14 May 2026.
Which products and versions are affected?: Filebrowser < 0.0.0-20260501183844-112740bdd41d; github.com/gtsteffaniak/filebrowser (Go) < 0.0.0-20260501183844-112740bdd41d, SEMVER:introduced=0,fixed=0.0.0-20260501183844-112740bdd41d; Gtsteffaniak FileBrowser Quantum < 1.3.1-stable, < 1.3.9-beta.
Is there a fix for CVE-2026-44542?: Yes. github.com/gtsteffaniak/filebrowser (Go): upgrade to 0.0.0-20260501183844-112740bdd41d or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-44542 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-44542?: Check whether you run Filebrowser, github.com/gtsteffaniak/filebrowser (Go) or Gtsteffaniak FileBrowser Quantum at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

github.com/gtsteffaniak/filebrowser (Go): upgrade to 0.0.0-20260501183844-112740bdd41d or later
```
go get github.com/gtsteffaniak/filebrowser@v0.0.0-20260501183844-112740bdd41d
```

Technical details

A path traversal vulnerability exists in FileBrowser Quantum's public API endpoints due to improper input sanitization. Specifically, in the 'public/api/resources' and 'public/api/resources/bulk' endpoints, attacker-controlled path input is joined with a trusted base path before the 'SanitizeUserPath()' function is called. This allows an unauthenticated attacker who possesses a valid public share hash (with delete permissions enabled) to use traversal sequences like '../' to escape the intended directory. An attacker can then delete any file within the storage scope of the user who created the share. The issue is fixed in versions 1.3.1-stable and 1.3.9-beta.

Affected products

gtsteffaniak FileBrowser Quantum < 1.3.1-stable, < 1.3.9-beta

Identifiers

CVE-2026-44542
GHSA-fwj3-42wh-8673
GO-2026-5383

Timeline

2026-05-01: advisory: GitHub Security Advisory published by maintainer
2026-05-14: disclosed: CVE published to NVD

References

https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-fwj3-42wh-8673

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