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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| siyuan-note | siyuan | < 3.8.0 | 3.8.0 |
References
- GitHub Security Advisory (GHSA-853m-gvvm-6rvx) vendor-advisory
- VulnCheck Advisory: SiYuan before v3.8.0 Secret Exfiltration via http_request URL third-party-advisory