Vulnerabilities CVE-2026-59809

CVE-2026-59809

Medium

Open

TLP:CLEAR

SiYuan before v3.8.0 Secret Exfiltration via http_request URL

NVD CVE.org

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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.

Details

CVSS Score: 6.9
CVSS Vector: 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
Confidence: 90%
Published: Aug 22, 2026
Last Modified: Aug 22, 2026

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