---
id: CVE-2026-73054
title: >-
  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
summary: >-
  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 att…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-287
published: '2026-08-15'
updated: '2026-08-15'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73054'
references:
  - url: >-
      https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c8w8-3pqp-wr83
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-websocket
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-08-16T13:39:04.554Z'
epss: 0.00539
epssPercentile: 0.42961
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.