High severity · published Aug 14, 2026
CVE-2026-72810
SiYuan before v3.7.4 Publish-Boundary Bypass via WebSocket
8.6
CVSS
0.5%
EPSS
No
On KEV
Description
SiYuan versions before v3.7.4 contain a publish-boundary bypass vulnerability in WebSocket broadcast sessions that allows anonymous readers to receive unfiltered edits. Attackers can establish a WebSocket connection to the publish surface and passively receive real-time content events including password-protected and forbidden documents without authentication.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Changed
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-2026-72810
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-72810
github.com
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-mw8r-mw84-88v2
www.vulncheck.com
https://www.vulncheck.com/advisories/siyuan-before-publish-boundary-bypass-via-websocket
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