---
id: "CVE-2026-121555"
kind: "vulnerability"
aliases: ["CVE-2026-121555"]
title: "Foxel: missing authentication lets anonymous users read any stored file"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["file-storage", "foxel", "other", "self-hosted"]
not_affected_if: ["not-exposed-to-network"]
published_at: "2026-11-03T16:17:27+00:00"
first_seen_at: "2026-11-03T16:21:44+00:00"
updated_at: "2026-11-03T16:23:42+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121555", "first_seen_at": "2026-11-03T16:21:44+00:00"}]
---

# Foxel: missing authentication lets anonymous users read any stored file

Foxel through version 2.4.0 exposes its /api/fs/stream and /api/fs/thumb endpoints without requiring login. An unauthenticated attacker can supply a mount prefix and path to download full file contents or thumbnails from any mount, bypassing PathRule permissions.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Confirm the Foxel version in use; versions through `2.4.0` are listed as affected.
- Request `/api/fs/stream` or `/api/fs/thumb` without a session token and see whether file content is returned.

## Fix

- Patch available via the linked GitHub fix; the fixed version is unknown from the sources.

## Timeline

- 2026-11-03T16:21:44+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121555

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/foxel-through-2.4.0-unauthenticated-file-read-via-api-fs-stream-and-api-fs-thumb
- [fix] Patch: github.com https://github.com/DrizzleTime/Foxel/commit/73d9fa825e1004d37abb7b10faea0cd7f5bcb463

## From the sources

Foxel through 2.4.0 contains a missing authentication vulnerability that allows unauthenticated attackers to read files by requesting the /api/fs/stream and /api/fs/thumb endpoints. Attackers can supply a VFS mount prefix and relative path to retrieve full file contents or thumbnails across all mounts, bypassing PathRule permission grants.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_