Is CVE-2026-100637 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-100637?

CVE-2026-100637 has a CVSS v3 severity of HIGH (7.6).

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CVE-2026-100637

Description

SiYuan versions before v3.8.4 contain a path traversal vulnerability in the checkoutRepo endpoint that allows authenticated administrators to write JSON files outside the workspace. Attackers can supply a sessionID parameter containing directory traversal sequences to overwrite arbitrary JSON files in pre-existing kernel-writable directories outside workspace boundaries.