CVE-2026-72810

SiYuan before v3.7.4 Publish-Boundary Bypass via WebSocket

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

siyuan-note · siyuan

CVSS v4.0 VULNCHECK

9.2 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/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:X/V:X/RE:X/U:X

CVSS v3.1 VULNCHECK

8.6 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS

0.54% chance of exploitation in the next 30 days, 44th percentile

Published

2026-08-14

Updated

2026-08-18

Proof-of-concept exploits (1)

• advisories/GHSA-mw8r-mw84-88v2

References

• CVE Record
• NVD entry