---
title: "CVE-2026-44542: FileBrowser Public Share DELETE API Path Traversal Allows Unauthenticated Arbitrary File Deletion"
url: https://erroneo.us/security/cve/CVE-2026-44542/
description: "CVE-2026-44542 (github.com/gtsteffaniak/filebrowser (Go)): FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to 1.3.1-stable and…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-14
date_modified: 2026-05-15
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-44542"
kev: false
cvss: 9.1
epss: 0.00605
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-44542: FileBrowser Public Share DELETE API Path Traversal Allows Unauthenticated Arbitrary File Deletion

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.6% , percentile 48: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 48% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes github.com/gtsteffaniak/filebrowser (Go) < 0.0.0-20260501183844-112740bdd41d, fixed in 0.0.0-20260501183844-112740bdd41d . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Go `github.com/gtsteffaniak/filebrowser` < 0.0.0-20260501183844-112740bdd41d → fixed: 0.0.0-20260501183844-112740bdd41d

## Affected products (CVE record)

- gtsteffaniak filebrowser: < 1.3.1-stable, < 1.3.9-beta

## Severity

- GitHub_M CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.60% probability of exploitation activity in the next 30 days; percentile 48.

## Sources

- [GitHub Advisory GHSA-fwj3-42wh-8673](https://github.com/advisories/GHSA-fwj3-42wh-8673)
- [CVE.org record CVE-2026-44542](https://www.cve.org/CVERecord?id=CVE-2026-44542)
- [NVD entry CVE-2026-44542](https://nvd.nist.gov/vuln/detail/CVE-2026-44542)
- [github.com](https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-fwj3-42wh-8673)
- [github.com](https://github.com/gtsteffaniak/filebrowser/commit/112740bdd41de7d5eb01e13ba49d406bfc463f69)

---
Source page: https://erroneo.us/security/cve/CVE-2026-44542/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt