CVE-2026-93921

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.

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