CVE-2026-110214
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.
Does this matter?
Lower severity and a low EPSS score (0.46%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 4.0
- 6.3 MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.46% probability · 39th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-321
- Source
- disclosure@vulncheck.com
EPSS moved from 0.5% on 14 October 2026 to 0.5% on 26 October 2026.
References
- 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
- 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
- https://github.com/xiaonuobase/Snowy/blob/v3.6.5/snowy-web-app/src/main/java/vip/xiaonuo/core/config/GlobalConfigure.java#L174-L175
- https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/snowy-dev-file-access-control
- https://www.vulncheck.com/advisories/snowy-3.6.5-hard-coded-download-signature-key-allows-unauthenticated-file-download
- https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/snowy-dev-file-access-control
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.