Vulnerability · Published Aug 15, 2026 · Assigned by VulnCheck

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

High 7.5

In plain English

A high-severity improper authentication in siyuan from siyuan-note. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.4%top 64.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/siyuan-note/siyuan/kernel	0.0.0-20260731131820-67bc300b6ea6	GHSA-c8w8-3pqp-wr83
Go	github.com/siyuan-note/siyuan/kernel	0.0.0-20260731131820-67bc300b6ea6	GO-2026-6831

Affected products (as reported)

Vendor	Product	Versions
siyuan-note	siyuan	0 – before 3.7.4

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

GitHub Security Advisory (GHSA-c8w8-3pqp-wr83) vendor-advisory
VulnCheck Advisory: SiYuan before v3.7.4 Authentication Bypass via WebSocket third-party-advisory