CVE-2026-126393
MEDIUM
NVD
CVSS Score
6.1
Severity
MEDIUM
Published
Nov 13, 2026
Vendor
unknown
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.