Medium severity4.9NVD Advisory· Published Aug 22, 2026

CVE-2026-59809

Description

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.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Siyuan Note/Siyuanllm-fuzzy
Range: <3.8.0

Patches

Vulnerability mechanics

References

github.com/siyuan-note/siyuan/security/advisories/GHSA-853m-gvvm-6rvxnvd
www.vulncheck.com/advisories/siyuan-before-secret-exfiltration-via-http-request-urlnvd

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cvss	0.319
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000