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. Attackers can compute HMAC-SHA256 signatures of guessed file ids offline to download stored files such as avatars, editor images and attachments.

• 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://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

• UNSCOREDCVE-2026-100413PoC
• LOWCVE-2026-102241PoC
• HIGHCVE-2026-103055PoC
• MEDIUMCVE-2026-103778
• HIGHCVE-2026-105035PoC
• HIGHCVE-2026-105392PoC
• MEDIUMCVE-2026-106172
• UNSCOREDCVE-2026-107171

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