Medium severity · published Sep 18, 2026
CVE-2026-93921
SiYuan through 3.8.4 Access Control Bypass via Dynamic Icon Endpoint
4.3
CVSS
0.4%
EPSS
No
On KEV
Description
SiYuan versions through 3.8.4 fail to enforce publish access control in the getDynamicIcon endpoint, allowing read-only token holders to access document metadata. Attackers can call the endpoint with type=8 and crafted content to read block titles, names, aliases, and hierarchical paths of restricted documents via template injection.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
siyuan · siyuan-note
through 3.8.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-93921
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-93921
github.com
https://github.com/siyuan-note/siyuan
github.com
https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/api/icon.go#L546-L549
github.com
https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/api/router.go#L51
github.com
https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/template.go#L485-L526
github.com
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-whcx-xxqh-c838
www.vulncheck.com
https://www.vulncheck.com/advisories/siyuan-through-3.8.4-access-control-bypass-via-dynamic-icon-endpoint
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