High severity · published Aug 12, 2026
CVE-2026-72789
SiYuan before v3.7.4 Authentication Bypass via Encrypted Notebooks
8.6
CVSS
0.4%
EPSS
No
On KEV
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.
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)0.4% · higher than 31% 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-2026-72789
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-72789
github.com
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-v684-q882-jgmq
www.vulncheck.com
https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-encrypted-notebooks
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