MEDIUM 6.9 NVD
CVE-2026-59809
SiYuan before v3.8.0 interpolates secret placeholders into the destination URL parameter of the http_request MCP tool, allowing attackers to exfiltrate stored s
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.
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-ur
This medium severity vulnerability with a CVSS score of 6.9 was published on 2026-08-22 via NVD.
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