{"cve":"CVE-2026-45303","nvd":{"published":"2026-05-15T22:16:53.977","modified":"2026-06-17T10:51:53.730","status":"Modified","description":"Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.6.5, through the HTML rendering view, scripts can be injected and executed. The frontend provides a function to visualize the HTML content of a current chat. The content is embedded in an iFrame with the allow-scripts allow-forms allow-same-origin sandbox directive. This means that the content is placed in a sandbox but with permission to execute scripts and access the parent’s data (e.g., local storage). As a result, only a few functions are restricted (e.g., displaying an alert box), but in effect, the sandbox attribute is largely nullified. This vulnerability is fixed in 0.6.5.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","score":7.7},"cwes":["CWE-79"],"references":["https://github.com/open-webui/open-webui/security/advisories/GHSA-4vrc-m9ch-6m3r","https://github.com/open-webui/open-webui/security/advisories/GHSA-4vrc-m9ch-6m3r"],"products":["openwebui:open_webui"],"source":"nvd","synced_at":"2026-10-19T22:35:16.954578616+00:00"},"epss":{"cve":"CVE-2026-45303","score":0.00225,"percentile":0.13278,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-4vrc-m9ch-6m3r","url":"https://osv.dev/vulnerability/GHSA-4vrc-m9ch-6m3r","summary":"Open WebUI has stored XSS via the HTML renedering view","modified":"2026-07-13T16:42:54.244167236Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":["<0.6.5"],"fixed":["0.6.5"]}]},{"id":"PYSEC-2026-2704","url":"https://osv.dev/vulnerability/PYSEC-2026-2704","summary":"Open WebUI has stored XSS via the HTML renedering view","modified":"2026-07-13T16:32:23.939173842Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":["<0.6.5"],"fixed":["0.6.5"]}]}],"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."]}