High severity · published Jan 19, 2026
CVE-2026-23850
SiYuan vulnerable to arbitrary file read
7.5
CVSS
0.6%
EPSS
No
On KEV
Description
SiYuan is a personal knowledge management system. In versions prior to 3.5.4, the markdown feature allows unrestricted server side html-rendering which allows arbitrary file read (LFD). Version 3.5.4 fixes the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
siyuan · siyuan-note
< 3.5.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-23850
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-23850
Product
https://github.com/siyuan-note/siyuan/blob/master/kernel/model/file.go#L1035
Product
https://github.com/siyuan-note/siyuan/blob/v3.4.2/kernel/api/filetree.go#L799-L886
Patch
https://github.com/siyuan-note/siyuan/commit/b2274baba2e11c8cf8901b0c5c871e5b27f1f6dd
Patch
https://github.com/siyuan-note/siyuan/commit/f8f4b517077b92c90c0d7b51ac11be1b34b273ad
Issue Tracking
https://github.com/siyuan-note/siyuan/issues/16860
Exploit
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-cv54-7wv7-qxcw
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