CVE-2026-45665

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{"affected": [{"affectedData": [{"product": "open-webui", "vendor": "open-webui", "versions": [{"status": "affected", "version": "< 0.8.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*", "matchCriteriaId": "D1CB836C-E6D5-4BFB-845D-004EC3CEAA31", "versionEndExcluding": "0.8.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.0, a Stored Cross-Site Scripting (XSS) vulnerability exists in the Banner component due to an improper sanitization order (specifically, DOMPurify is executed before the marked library). This vulnerability allows a compromised or malicious administrator to plant a malicious payload in the global banner. Crucially, this vector enables Privilege Escalation, as the malicious banner is rendered for all users, including the Super Admin (Primary Admin). Consequently, the payload successfully bypasses the existing security mechanism. An attacker can leverage this to steal the Super Admin's session token This vulnerability is fixed in 0.8.0."}, {"lang": "es", "value": "Open WebUI es una plataforma de inteligencia artificial autoalojada dise\u00f1ada para operar completamente sin conexi\u00f3n. Antes de 0.8.0, existe una vulnerabilidad de cross-site scripting (XSS) almacenado en el componente Banner debido a un orden de saneamiento incorrecto (espec\u00edficamente, DOMPurify se ejecuta antes de la biblioteca marked). Esta vulnerabilidad permite a un administrador comprometido o malicioso insertar una carga \u00fatil maliciosa en el banner global. Fundamentalmente, este vector permite la escalada de privilegios, ya que el banner malicioso se renderiza para todos los usuarios, incluyendo al Super Administrador (Administrador Principal). En consecuencia, la carga \u00fatil elude con \u00e9xito el mecanismo de seguridad existente. Un atacante puede aprovechar esto para robar el token de sesi\u00f3n del Super Administrador. Esta vulnerabilidad se corrige en 0.8.0."}], "id": "CVE-2026-45665", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.7, "impactScore": 5.8, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-45665", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-05-18T19:46:00.844836Z", "version": "2.0.3"}}]}, "published": "2026-05-15T22:16:55.920", "references": [{"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-cqp4-qqvg-3787"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-cqp4-qqvg-3787"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

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