---
cve: "CVE-2026-56400"
severity: "CRITICAL"
cvss: 9.0
epss: "0.5%"
vendor: "open-webui"
kev: false
exploited: false
published: "2026-07-15 12:18:03"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-11-09T15:03:44+01:00"
---

# CVE-2026-56400

> 9.0 CRITICAL · 🧪 PoC

## Beschreibung

open-webui before 0.3.14 contains a cross-origin resource sharing misconfiguration allowing arbitrary origins with allow_origins=* and authenticated requests to the /api/v1/functions endpoint. Attackers can execute arbitrary code on the openwebui instance by crafting malicious cross-site requests from attacker-controlled websites when an admin user visits them.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-07-15 18:33:15
- CNA-CVSS: **9.0** (`CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)

## CISA-Anreicherung (vulnrichment/ADP)

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

## CVSS-Vektor

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

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

## Schwachstellen-Klasse

- **CWE-613** — DEPRECATED: Insufficient Session Expiration
  This entry has been deprecated because it was insufficiently clear. Consider CWE-1462 and its descendants.

## Patch verfügbar (OSV)

- 8a620cab442ab61b1f80c21d6b68df7b020fb10c (Commit)

## Referenzen

- <https://github.com/open-webui/open-webui/security/advisories/GHSA-6xcp-7mpr-m7wm>
- <https://www.vulncheck.com/advisories/open-webui-remote-code-execution-via-cors-misconfiguration-and-session-validation>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-56400/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_