---
cve: "CVE-2026-77086"
severity: "CRITICAL"
cvss: 9.4
epss: "68.6%"
vendor: "siyuan-note"
kev: false
exploited: false
published: "2026-08-21 11:17:06"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-02T15:57:43+02:00"
---

# CVE-2026-77086

> 9.4 CRITICAL · 🧪 PoC

## Beschreibung

SiYuan before v3.7.4 fails to validate the packageName parameter in Bazaar install and uninstall endpoints, allowing authenticated administrators to perform path traversal via directory traversal sequences. Attackers with admin access can write arbitrary files to any location via install operations or recursively delete directories via uninstall operations by supplying crafted packageName values.

## CVSS-Vektor

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

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

## Referenzen

- <https://github.com/siyuan-note/siyuan/security/advisories/GHSA-wr4w-7vjm-mmx3>
- <https://www.vulncheck.com/advisories/siyuan-before-path-traversal-via-packagename>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-77086) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_