Medium 4.3Published Sep 18, 2026

CVE-2026-93921SiYuan through 3.8.4 Access Control Bypass via Dynamic Icon Endpoint

Updated under an hour ago (Oct 28, 2026, 3:40 AM ET)

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Every CVE for siyuan-note siyuan

Exploited in the last 30 days

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: 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Sep 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

siyuan-note siyuan siyuan_note:siyuan (from the name)	through 3.8.4	CNA record

References

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-whcx-xxqh-c838	vendor-advisory
https://github.com/siyuan-note/siyuan	product
https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/api/router.go#L51	technical-description
https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/template.go#L485-L526	technical-description
https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/api/icon.go#L546-L549	technical-description
https://www.vulncheck.com/advisories/siyuan-through-3.8.4-access-control-bypass-via-dynamic-icon-endpoint	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.