---
cve: "CVE-2026-100636"
severity: "HIGH"
cvss: 8.3
epss: "0.5%"
vendor: "siyuan-note"
kev: false
exploited: false
published: "2026-09-26 13:23:10"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-28T16:42:24+02:00"
---

# CVE-2026-100636

> 8.3 HIGH · 🧪 PoC

## Beschreibung

SiYuan versions before v3.8.4 contain a path traversal vulnerability in the exportBrowserHTML endpoint that allows authenticated administrators to write arbitrary HTML content to index.html outside the workspace directory. Attackers can supply a folder parameter with directory traversal sequences to escape the export directory and overwrite index.html in any pre-existing kernel-writable location, enabling stored XSS or workspace defacement.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-09-26 13:23:10
- CNA-CVSS: **8.3** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L`)

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 9f775e8a12daef8255556097396f9b2739078892 (Commit)

## Referenzen

- <https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jf98-m24w-gm9m>
- <https://www.vulncheck.com/advisories/siyuan-before-3.8.4-path-traversal-via-exportbrowserhtml-folder>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-100636) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_