Vulnerability · Published Sep 18, 2026 · Assigned by VulnCheck
CVE-2026-93921SiYuan through 3.8.4 Access Control Bypass via Dynamic Icon Endpoint
Medium 4.3
In plain English
A medium-severity missing authorization in siyuan from siyuan-note. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).
Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.4%top 68.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| siyuan-note | siyuan | 0 – through 3.8.4 |
Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
References
- GitHub Security Advisory (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
- VulnCheck Advisory: SiYuan through 3.8.4 Access Control Bypass via Dynamic Icon Endpoint third-party-advisory