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Vulnerability record · CVE-2026-73054 · published 15 August 2026

CVE-2026-73054: Improper authentication vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.54% · top 56.9% CWE-287 · Improper authentication Deferred
8.7CVSS 4.0 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
26 Aug 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-73054), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.