# CVE-2026-70486

## Summary

- **CVE ID:** CVE-2026-70486
- **Severity:** HIGH
- **CVSS Score:** 8.2 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N)
- **CWE:** CWE-79, CWE-1021
- **Published:** Aug 4, 2026
- **Last Modified:** Aug 5, 2026

## Description

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.

## Affected Products

- open-webui — open-webui (>= 0.9.0, < 0.11.0)

## References

- [CNA](https://github.com/open-webui/open-webui/security/advisories/GHSA-3xpf-xq7r-v8c5)
- [CNA](https://github.com/open-webui/open-webui/pull/26907)
- [CNA](https://github.com/open-webui/open-webui/commit/65a5fad7b97db99d490d81f4e0860282c3a4543c)
- [CNA](https://github.com/open-webui/open-webui/releases/tag/v0.11.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.37%
- **EPSS Percentile:** 30.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._