medium4.9
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 …
Impact
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 products
| Product | Affected versions |
|---|---|
| SiYuan | before 3.8.0 |
Versions were read from the advisory text. No structured product data has been published for this record yet.