High severity · published Aug 15, 2026
CVE-2026-73054
SiYuan before v3.7.4 Authentication Bypass via WebSocket
7.5
CVSS
0.5%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
siyuan · siyuan-note
before 3.7.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-73054
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-73054
github.com
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c8w8-3pqp-wr83
www.vulncheck.com
https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-websocket
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