CVE-2026-59809

Summary

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 Software

Weaknesses

• CWE-201: Insertion of Sensitive Information Into Sent Data

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-853m-gvvm-6rvx
• https://www.vulncheck.com/advisories/siyuan-before-secret-exfiltration-via-http-request-url

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