---
cve: "CVE-2026-74904"
severity: "HIGH"
cvss: 8.7
epss: "0.5%"
vendor: "siyuan-note"
kev: false
exploited: false
published: "2026-08-18 12:19:30"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-04T13:25:29+02:00"
---

# CVE-2026-74904

> 8.7 HIGH · 🧪 PoC

## Beschreibung

SiYuan: 17 block metadata/content endpoints in kernel/api/block.go have zero publish-access filtering, reachable by anonymous publish-mode readers

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - Automatable: **yes**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Referenzen

- <https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4vpg-gwqq-w44c>
- <https://www.vulncheck.com/advisories/siyuan-before-missing-authorization-via-block-api>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-74904>
- <https://github.com/siyuan-note/siyuan/commit/bd067a4fe9b208c0858d8d9dc6220dc8affc403e>
- <https://github.com/siyuan-note/siyuan/releases/tag/v3.8.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-74904) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_