Medium severity · published Sep 4, 2026
CVE-2026-85578
SiYuan through 3.8.1 Authorization Bypass via getFile
6.5
CVSS
0.4%
EPSS
No
On KEV
Description
SiYuan through 3.8.1 contains an authorization bypass vulnerability in the /api/file/getFile endpoint that allows readers to retrieve files from notebooks explicitly configured as Visible:false. Attackers with reader role can access private workspace files including notebook metadata and internal configuration by knowing the hidden notebook identifier and file path.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
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
through 3.8.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-85578
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-85578
vendor-advisory
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8ggq-wq3f-vxrw
third-party-advisory
https://www.vulncheck.com/advisories/siyuan-through-3.8.1-authorization-bypass-via-getfile
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