What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-19 · updated 2026-09-21
• Weakness: CWE-862

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

• siyuan-note siyuan: through 3.8.4

References

• 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

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