Description
SiYuan before 3.8.10 contains a server-side request forgery vulnerability in the skill-install download path because fetchBytes performs only a parse-time hostname check instead of using ssrfSafeClient. Attackers can supply a skill URL via the MCP skill install action that redirects or DNS-rebinds to loopback addresses, reaching internal services and metadata endpoints.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| siyuan-note | SiYuan | 0 <3.8.10 | — |