{"cve":"CVE-2026-45665","nvd":{"published":"2026-05-15T22:16:55.920","modified":"2026-06-17T10:52:26.317","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N","score":8.1},"cwes":["CWE-79"],"references":["https://github.com/open-webui/open-webui/security/advisories/GHSA-cqp4-qqvg-3787","https://github.com/open-webui/open-webui/security/advisories/GHSA-cqp4-qqvg-3787"],"products":["openwebui:open_webui"],"source":"nvd","synced_at":"2026-10-19T22:35:16.954578616+00:00"},"epss":{"cve":"CVE-2026-45665","score":0.00335,"percentile":0.26847,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-cqp4-qqvg-3787","url":"https://osv.dev/vulnerability/GHSA-cqp4-qqvg-3787","summary":"Open WebUI has Stored XSS in Banner Component via Improper Sanitization Order","modified":"2026-05-19T16:15:17.056436733Z","packages":[{"ecosystem":"npm","name":"open-webui","purl":"pkg:npm/open-webui","ranges":["<0.8.0"],"fixed":["0.8.0"]}]}],"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."]}