CVE-2026-33476: Siyuan has an Unauthenticated Arbitrary File Read via Path Traversal

March 20, 2026

The Siyuan kernel exposes an unauthenticated file-serving endpoint under */appearance/filepath. Due to improper path sanitization, attackers can perform directory traversal and read arbitrary files accessible to the server process.

Authentication checks explicitly exclude this endpoint, allowing exploitation without valid credentials.

References

github.com/advisories/GHSA-hhgj-gg9h-rjp7
github.com/siyuan-note/siyuan
github.com/siyuan-note/siyuan/commit/009bb598b3beccc972aa5f1ed88b3b224326bf2a
github.com/siyuan-note/siyuan/security/advisories/GHSA-hhgj-gg9h-rjp7
nvd.nist.gov/vuln/detail/CVE-2026-33476

Code Behaviors & Features

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