---
id: CVE-2026-110214
title: >-
  Snowy 3.6.5 contains a hard-coded HMAC key vulnerability that allows
  unauthenticated attackers to forge download signatures for the
  /dev/file/download endpoint by using the published FILE_DOWNLOAD_SIGN_SECRET
  constant
summary: >-
  Snowy 3.6.5 contains a hard-coded HMAC key vulnerability that allows
  unauthenticated attackers to forge download signatures for the
  /dev/file/download endpoint by using the published FILE_DOWNLOAD_SIGN_SECRET
  constant. Attackers can comp…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-321
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T20:17:27.613'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110214'
references:
  - url: >-
      https://github.com/xiaonuobase/Snowy/blob/v3.6.5/snowy-plugin/snowy-plugin-dev/src/main/java/vip/xiaonuo/dev/modular/file/service/impl/DevFileServiceImpl.java#L419-L445
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/xiaonuobase/Snowy/blob/v3.6.5/snowy-plugin/snowy-plugin-dev/src/main/java/vip/xiaonuo/dev/modular/file/service/impl/DevFileServiceImpl.java#L78
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/xiaonuobase/Snowy/blob/v3.6.5/snowy-web-app/src/main/java/vip/xiaonuo/core/config/GlobalConfigure.java#L174-L175
    label: disclosure@vulncheck.com
  - url: 'https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/snowy-dev-file-access-control'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/snowy-3.6.5-hard-coded-download-signature-key-allows-unauthenticated-file-download
    label: disclosure@vulncheck.com
  - url: 'https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/snowy-dev-file-access-control'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
ingestedAt: '2026-10-13T19:43:28.936Z'
---

## Overview

Snowy 3.6.5 contains a hard-coded HMAC key vulnerability that allows unauthenticated attackers to forge download signatures for the /dev/file/download endpoint by using the published FILE_DOWNLOAD_SIGN_SECRET constant. Attackers can compute HMAC-SHA256 signatures of guessed file ids offline to download stored files such as avatars, editor images and attachments.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.