{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-109296","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-10-12T14:12:52.833Z","datePublished":"2026-10-12T16:04:55.400Z","dateUpdated":"2026-10-12T16:04:55.400Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-10-12T16:04:55.400Z"},"datePublic":"2026-09-27T00:00:00.000Z","title":"Open WebUI before 0.11.4 Missing Authorization via Backend Index on Model Routes","descriptions":[{"lang":"en","value":"Open WebUI before 0.11.4 contains a missing authorization vulnerability that allows authenticated users to reach disabled model provider backends by supplying an explicit backend index. Attackers can pass the index as a path segment or query parameter on Ollama and OpenAI-compatible listing routes to trigger requests carrying configured API keys, read version strings, and enumerate connections."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Authorization Bypass Through User-Controlled Key","cweId":"CWE-639","type":"CWE"}]}],"affected":[{"vendor":"open-webui","product":"open-webui","defaultStatus":"unaffected","packageURL":"pkg:pypi/open-webui","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"0.11.4"},{"version":"0.11.4","status":"unaffected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*","versionEndExcluding":"0.11.4"}]}]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM"}}],"references":[{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-hm62-64q2-6gxw","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-hm62-64q2-6gxw)"},{"name":"VulnCheck Advisory: Open WebUI before 0.11.4 Missing Authorization via Backend Index on Model Routes","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/open-webui-before-0.11.4-missing-authorization-via-backend-index-on-model-routes"}],"credits":[{"lang":"en","value":"ahkarl13","type":"reporter"},{"lang":"en","value":"Classic298","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}}}}