Vulnerability · Published Oct 13, 2026 · Assigned by VulnCheck
CVE-2026-110214Snowy 3.6.5 Hard-coded Download Signature Key Allows Unauthenticated File Download
Low 3.7
In plain English
A low-severity security flaw in Snowy from xiaonuobase. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities).
Severity (CVSS 3.1)3.7Low
Exploit odds (30 days)0.5%top 60.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| xiaonuobase | Snowy | 3.6.5 – through 3.6.5 |
Weakness: CWE-321 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
References
- https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/snowy-dev-file-access-control third-party-advisory
- 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 technical-description
- 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 technical-description
- https://github.com/xiaonuobase/Snowy/blob/v3.6.5/snowy-web-app/src/main/java/vip/xiaonuo/core/config/GlobalConfigure.java#L174-L175 technical-description
- VulnCheck Advisory: Snowy 3.6.5 Hard-coded Download Signature Key Allows Unauthenticated File Download third-party-advisory