CVE-2026-70486

8.2 HIGHpublic exploit available

Published 2026-08-04 · Updated 2026-08-05

AI risk analysis

Summary: The flaw allows any authenticated user to execute scripts in the Open WebUI origin, potentially leading to session hijacking and server-side code execution.
Exploitability: Exploitation is relatively easy for any authenticated user with access to a configured terminal server, requiring only a previewed file with embedded scripts.
Blast radius: If exploited, the impact could be severe, including full account takeover and potential server compromise for admin users.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to version 0.11.0 or later.

auth-bypassrcewebscript-executionsession-hijacking

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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.

CVSS vector

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

Weaknesses

CWE-79, CWE-1021

Public exploit & PoC references

References

Data: NVD (public domain). Analysis: local $0 model. Defensive use only.