What’s Vulnerable › Vulnerabilities

CVE-2026-73054: SiYuan before v3.7.4 Authentication Bypass via WebSocket

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-08-26
• Weakness: CWE-287

Description

SiYuan versions before v3.7.4 contain an authentication bypass vulnerability in the WebSocket endpoint caused by differential parsing of query parameters between authentication exemption and session quarantine checks. Unauthenticated attackers can craft a malicious WebSocket URI with duplicated query parameters to bypass access auth code validation and receive the live kernel event stream including document identifiers, titles, and operation logs.

Affected products

• siyuan-note siyuan: before 3.7.4 — fixed in 3.7.4

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.7.4. Check the vendor advisory for mitigations.

References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c8w8-3pqp-wr83
• https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-websocket
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c8w8-3pqp-wr83

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