{"id":"CVE-2026-70486","published":"2026-08-04T20:16:55.747","lastModified":"2026-08-05T15:17:10.497","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.","cvssScore":8.2,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N","cwes":["CWE-79","CWE-1021"],"vendors":[],"products":[],"references":[{"url":"https://github.com/open-webui/open-webui/commit/65a5fad7b97db99d490d81f4e0860282c3a4543c","tags":[]},{"url":"https://github.com/open-webui/open-webui/pull/26907","tags":[]},{"url":"https://github.com/open-webui/open-webui/releases/tag/v0.11.0","tags":[]},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-3xpf-xq7r-v8c5","tags":[]}],"exploitRefs":[{"url":"https://github.com/open-webui/open-webui/commit/65a5fad7b97db99d490d81f4e0860282c3a4543c","tags":[]},{"url":"https://github.com/open-webui/open-webui/pull/26907","tags":[]},{"url":"https://github.com/open-webui/open-webui/releases/tag/v0.11.0","tags":[]},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-3xpf-xq7r-v8c5","tags":[]}],"hasPoc":true,"ai":{"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.","remediation":"Upgrade to version 0.11.0 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["auth-bypass","rce","web","script-execution","session-hijacking"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-10-03T08:59:34.679Z"}}