CVE-2026-72810: SiYuan before v3.7.4 Publish-Boundary Bypass via WebSocket

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-14 · updated 2026-08-26
Weakness: CWE-862

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.

Affected products

siyuan-note siyuan: before 3.7.4 — fixed in 3.7.4

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.7.4. Check the vendor advisory for mitigations.

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-mw8r-mw84-88v2
https://www.vulncheck.com/advisories/siyuan-before-publish-boundary-bypass-via-websocket
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-mw8r-mw84-88v2

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