---
cve: "CVE-2026-70486"
severity: "HIGH"
cvss: 8.2
epss: "0.3%"
vendor: "open-webui"
kev: false
exploited: false
published: "2026-08-04 20:16:55"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T05:35:43+02:00"
---

# CVE-2026-70486

> 8.2 HIGH · 🧪 PoC

## Beschreibung

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, the terminal file-preview serveUrl iframe branch always granted allow-same-origin together with allow-scripts for HTML files served from the application origin. Any authenticated user with access to a configured terminal server could cause script in a previewed file to run in the Open WebUI origin, read the victim's session token from localStorage, and take over the account, with possible server-side code execution if the victim was an admin or held workspace.functions. This issue is fixed in 0.11.0.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- f9590b8017199e56d5e953657e6498e3cef1d246 (Commit)
- 65a5fad7b97db99d490d81f4e0860282c3a4543c (Commit)

## Referenzen

- <https://github.com/open-webui/open-webui/security/advisories/GHSA-3xpf-xq7r-v8c5>
- <https://github.com/open-webui/open-webui/pull/26907>
- <https://github.com/open-webui/open-webui/commit/65a5fad7b97db99d490d81f4e0860282c3a4543c>
- <https://github.com/open-webui/open-webui/releases/tag/v0.11.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-70486) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_