---
cve: "CVE-2026-34448"
severity: "CRITICAL"
cvss: 9.1
epss: "0.7%"
vendor: "siyuan-note"
kev: false
exploited: false
published: "2026-03-31 22:16:19"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-09T21:32:01+02:00"
---

# CVE-2026-34448

> 9.1 CRITICAL · 🧪 PoC

## Beschreibung

SiYuan is a personal knowledge management system. Prior to version 3.6.2, an attacker who can place a malicious URL in an Attribute View mAsse field can trigger stored XSS when a victim opens the Gallery or Kanban view with “Cover From -> Asset Field” enabled. The vulnerable code accepts arbitrary http(s) URLs without extensions as images, stores the attacker-controlled string in coverURL, and injects it directly into an  attribute without escaping. In the Electron desktop client, the injected JavaScript executes with nodeIntegration enabled and contextIsolation disabled, so the XSS reaches arbitrary OS command execution under the victim’s account. This issue has been patched in version 3.6.2.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Erforderlich | good |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 29b104f338f9b0cdda0df852871a09a6268ced2f (Commit)

## Referenzen

- <https://github.com/siyuan-note/siyuan/security/advisories/GHSA-rx4h-526q-4458>
- <https://github.com/siyuan-note/siyuan/issues/17246>
- <https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-34448/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_