CVE-2026-59809
6.9
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Summary
SiYuan before v3.8.0 interpolates secret placeholders into the destination URL parameter of the http_request MCP tool, allowing attackers to exfiltrate stored secrets. An MCP client can craft a request with an attacker-controlled URL containing secret placeholders to send plaintext secret values to any public host without confirmation.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| siyuan-note | siyuan | 0 < 3.8.0 | affected |
| siyuan-note | siyuan | 3.8.0 | unaffected |
Weaknesses
- CWE-201: Insertion of Sensitive Information Into Sent Data
References
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-853m-gvvm-6rvx
- https://www.vulncheck.com/advisories/siyuan-before-secret-exfiltration-via-http-request-url
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