---
id: CVE-2026-93921
title: >-
  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
summary: >-
  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 bl…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-862
vendor: siyuan-note
product: github.com/siyuan-note/siyuan/kernel
affected:
  - github.com/siyuan-note/siyuan/kernel <= 3.8.4
published: '2026-09-19'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T15:17:35.930'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93921'
references:
  - url: 'https://github.com/siyuan-note/siyuan'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/api/icon.go#L546-L549
    label: disclosure@vulncheck.com
  - url: 'https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/api/router.go#L51'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/template.go#L485-L526
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/siyuan-note/siyuan/security/advisories/GHSA-whcx-xxqh-c838
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/siyuan-through-3.8.4-access-control-bypass-via-dynamic-icon-endpoint
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/siyuan-note/siyuan/security/advisories/GHSA-whcx-xxqh-c838
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00378
epssPercentile: 0.29073
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-21T14:10:30.546665Z'
ingestedAt: '2026-09-18T23:54:36.626Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.