CVE-2026-126393
SiYuan before 3.8.10 SSRF via Skill-Install Download Redirect and DNS Rebinding
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-918 |
| Vendor | siyuan-note |
| Product | siyuan |
| Published | Nov 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
siyuan-note / siyuan
0 < 3.8.10
References
Credits
🔍 Figo5