---
cve: "CVE-2026-116827"
severity: "HIGH"
cvss: 8.2
epss: ""
vendor: "YesWiki"
kev: false
exploited: false
published: "2026-10-27 00:17:18"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-29T18:37:09+01:00"
---

# CVE-2026-116827

> 8.2 HIGH · 🧪 PoC

## Beschreibung

YesWiki before 4.7.0 contains a server-side request forgery vulnerability in the Bazar CSV import copyUrlToLocalFile() function that allows authenticated administrators to make arbitrary outbound requests by supplying crafted URLs in CSV file or image fields. Attackers can bypass the extension check with a query-string suffix or redirects to fetch cloud metadata credentials, internal services, or local files via file://, with responses stored in the web-accessible files/ directory.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-10-26 23:05:51
- CNA-CVSS: **8.2** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N`)

## CVSS-Vektor

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

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

## Schwachstellen-Klasse

- **CWE-918** — Server-Side Request Forgery (SSRF)
  The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

## Angriffsmuster (CAPEC)

- [CAPEC-664 — Server Side Request Forgery](https://capec.mitre.org/data/definitions/664.html) _(Severity: High)_

## Patch verfügbar (OSV)

- bba4abccdf68476dde3d7119019139121849fb32 (Commit)

## Referenzen

- <https://github.com/YesWiki/yeswiki/security/advisories/GHSA-v38g-qc7g-q3mq>
- <https://www.vulncheck.com/advisories/yeswiki-before-4.7.0-ssrf-via-copyurltolocalfile-in-bazar-csv-import>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-116827/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_