CVE-2026-72789: SiYuan before v3.7.4 Authentication Bypass via Encrypted Notebooks

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-12 · updated 2026-10-24
Weakness: CWE-862

Description

SiYuan before v3.7.4 fails to properly validate publish access for encrypted notebooks, treating them as publicly accessible by default. Anonymous readers can enumerate and retrieve fully decrypted document content from unlocked encrypted notebooks through the publish API without authentication or key material.

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-v684-q882-jgmq
https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-encrypted-notebooks
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-v684-q882-jgmq

Get alerted when CVE-2026-72789 or the next vulnerability affects your stack