{"cve":"CVE-2026-70486","nvd":{"published":"2026-08-04T20:16:55.747","modified":"2026-09-18T14:46:56.237","status":"Analyzed","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","score":5.4},"cwes":["CWE-79","CWE-1021"],"references":["https://github.com/open-webui/open-webui/commit/65a5fad7b97db99d490d81f4e0860282c3a4543c","https://github.com/open-webui/open-webui/pull/26907","https://github.com/open-webui/open-webui/releases/tag/v0.11.0","https://github.com/open-webui/open-webui/security/advisories/GHSA-3xpf-xq7r-v8c5"],"products":["openwebui:open_webui"],"source":"nvd","synced_at":"2026-10-19T22:47:10.050265369+00:00"},"epss":{"cve":"CVE-2026-70486","score":0.0038,"percentile":0.31973,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-3xpf-xq7r-v8c5","url":"https://osv.dev/vulnerability/GHSA-3xpf-xq7r-v8c5","summary":"Open WebUI: Same-origin XSS to account takeover via terminal file-preview iframe hardcoding allow-same-origin","modified":"2026-08-19T05:15:06.715142810Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":[">=0.9.0 <0.11.0"],"fixed":["0.11.0"]}]},{"id":"PYSEC-2026-3641","url":"https://osv.dev/vulnerability/PYSEC-2026-3641","summary":"Open WebUI: Same-origin XSS to account takeover via terminal file-preview iframe hardcoding allow-same-origin","modified":"2026-08-10T11:30:14.392745307Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":[">=0.9.0 <0.11.0"],"fixed":["0.11.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}