{"id":"CVE-2026-70486","title":"Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform","summary":"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 s…","severity":"high","cvss":8.2,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N","cwe":["CWE-79","CWE-1021"],"vendor":"openwebui","product":"open_webui","affected":["open_webui >= 0.9.0, < 0.11.0"],"patched":["open_webui 0.11.0"],"published":"2026-08-04","updated":"2026-09-18","sourceUpdated":"2026-09-18T14:46:56.237","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-70486","references":[{"url":"https://github.com/open-webui/open-webui/commit/65a5fad7b97db99d490d81f4e0860282c3a4543c","label":"security-advisories@github.com"},{"url":"https://github.com/open-webui/open-webui/pull/26907","label":"security-advisories@github.com"},{"url":"https://github.com/open-webui/open-webui/releases/tag/v0.11.0","label":"security-advisories@github.com"},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-3xpf-xq7r-v8c5","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-3xpf-xq7r-v8c5"}],"tags":["nvd","ghsa","pip"],"epss":0.00307,"epssPercentile":0.23571,"aliases":["GHSA-3xpf-xq7r-v8c5"],"ecosystem":"pip","ingestedAt":"2026-08-04T20:41:43.825Z","slug":"CVE-2026-70486","body":"## Overview\n\nOpen 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.\n\n## Affected\n\n- `open_webui >= 0.9.0, < 0.11.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `open_webui 0.11.0`\n\n## Package advisory (CVE-2026-70486)\n\nAffected packages:\n\n- `open-webui >= 0.9.0, <= 0.10.2`\n\nPatched in:\n\n- `open-webui 0.11.0`\n\nSource: https://github.com/advisories/GHSA-3xpf-xq7r-v8c5","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}