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.
CVSS 4.9EPSS 0.244%Risk 0.5
View source- Published
- 2026-08-22 13:16:39
- Affected versions
- <3.8.0
- Type
- Other
- Last modified
- 2026-08-26 17:17:08
- Vector
- CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N