{"id":"CVE-2026-70480","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 0.6.34 until 0.11.0, Open WebUI renders vega and vega-lite fenced code blocks in chat content by building a Vega view in the viewer browser withou…","severity":"medium","cvss":4.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N","cwe":["CWE-918"],"vendor":"openwebui","product":"open_webui","affected":["open_webui >= 0.6.34, < 0.11.0"],"patched":["open_webui 0.11.0"],"published":"2026-08-04","updated":"2026-09-18","sourceUpdated":"2026-09-18T14:45:55.337","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-70480","references":[{"url":"https://github.com/open-webui/open-webui/commit/5278eb906ebecefc6538a19bc86df09d997e43e6","label":"security-advisories@github.com"},{"url":"https://github.com/open-webui/open-webui/pull/26806","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-rffm-9q57-q649","label":"security-advisories@github.com"},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-rffm-9q57-q649","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/advisories/GHSA-rffm-9q57-q649"}],"tags":["nvd","ghsa","pip"],"epss":0.00198,"epssPercentile":0.09925,"aliases":["GHSA-rffm-9q57-q649"],"ecosystem":"pip","ingestedAt":"2026-08-04T20:41:43.916Z","slug":"CVE-2026-70480","body":"## Overview\n\nOpen WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.34 until 0.11.0, Open WebUI renders vega and vega-lite fenced code blocks in chat content by building a Vega view in the viewer browser without a restricted resource loader. Any user who can place such a block where another user will see it can make that user browser issue attacker-chosen outbound GET requests and read responses from same-origin or CORS-permissive targets into the rendered page. This issue is fixed in 0.11.0.\n\n## Affected\n\n- `open_webui >= 0.6.34, < 0.11.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `open_webui 0.11.0`\n\n## Package advisory (CVE-2026-70480)\n\nAffected packages:\n\n- `open-webui >= 0.6.34, < 0.11.0`\n\nPatched in:\n\n- `open-webui 0.11.0`\n\nSource: https://github.com/advisories/GHSA-rffm-9q57-q649","depth":"sunlit","depthScore":23,"depthScoreParts":{"impact":22.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}