{"apiVersion":"1.0","identifier":"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.","publishedAt":"2026-08-22T13:16:39","lastModifiedAt":"2026-08-26T17:17:08","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-59809","cvssScore":4.9,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N","epssProbability":0.00244,"riskScore":0.5,"affectedProduct":"SiYuan","affectedVersions":"<3.8.0","vulnerabilityType":"Other","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-59809","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-59809","en":"https://www.redsauce.net/en/cves/CVE-2026-59809","fr":"https://www.redsauce.net/fr/cves/CVE-2026-59809","pt":"https://www.redsauce.net/pt/cves/CVE-2026-59809","de":"https://www.redsauce.net/de/cves/CVE-2026-59809","sk":"https://www.redsauce.net/sk/cves/CVE-2026-59809","el":"https://www.redsauce.net/el/cves/CVE-2026-59809"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-59809"}}