{"id":"CVE-2026-54020","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. Prior to 0.11.0, Open WebUI resolved a hostname during URL validation and rejected private, loopback, and link-local addresses, but the HTTP clients re…","severity":"medium","cvss":6.3,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N","cwe":["CWE-367","CWE-918"],"vendor":"openwebui","product":"open_webui","affected":["open_webui < 0.11.0"],"patched":["open_webui 0.11.0"],"published":"2026-08-04","updated":"2026-09-18","sourceUpdated":"2026-09-18T14:58:07.103","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-54020","references":[{"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-h6x2-583h-x99r","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-h6x2-583h-x99r"}],"tags":["nvd","ghsa","pip"],"epss":0.00213,"epssPercentile":0.11938,"aliases":["GHSA-h6x2-583h-x99r"],"ecosystem":"pip","ingestedAt":"2026-08-04T20:41:43.710Z","slug":"CVE-2026-54020","body":"## Overview\n\nOpen WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.11.0, Open WebUI resolved a hostname during URL validation and rejected private, loopback, and link-local addresses, but the HTTP clients resolved the hostname again at connection time. An authenticated attacker who controlled authoritative DNS for a submitted hostname could answer with a public address during validation and an internal one during connection, reaching cloud metadata, loopback admin APIs, or internal services through URL ingest, chat image_url fetches, image editing, or OAuth profile-picture fetches, with most paths returning the response to the attacker and the OAuth path forwarding the OAuth access token. This issue is fixed in 0.11.0.\n\n## Affected\n\n- `open_webui < 0.11.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `open_webui 0.11.0`\n\n## Package advisory (CVE-2026-54020)\n\nAffected packages:\n\n- `open-webui <= 0.10.2`\n\nPatched in:\n\n- `open-webui 0.11.0`\n\nSource: https://github.com/advisories/GHSA-h6x2-583h-x99r","depth":"sunlit","depthScore":35,"depthScoreParts":{"impact":34.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}