{"cve":"CVE-2026-45315","nvd":{"published":"2026-05-15T22:16:54.250","modified":"2026-06-17T10:51:54.450","status":"Modified","description":"Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the audio transcription upload endpoint takes the file extension from the user-supplied filename and saves the file under CACHE_DIR/audio/transcriptions/.. The /cache/{path} route serves these files via FileResponse, which sets Content-Type from the on-disk extension and emits no Content-Disposition. A verified user with the default-on chat.stt permission can upload a polyglot WAV+HTML file named pwn.html and trick any other user into opening the resulting URL — the response comes back as text/html and any embedded <script> runs in the Open WebUI origin. This vulnerability is fixed in 0.9.3.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","score":8.7},"cwes":["CWE-79","CWE-434","CWE-646"],"references":["https://github.com/open-webui/open-webui/security/advisories/GHSA-m8f9-9whg-f4xr","https://github.com/open-webui/open-webui/security/advisories/GHSA-m8f9-9whg-f4xr"],"products":["openwebui:open_webui"],"source":"nvd","synced_at":"2026-10-19T22:35:16.954578616+00:00"},"epss":{"cve":"CVE-2026-45315","score":0.00186,"percentile":0.08271,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-m8f9-9whg-f4xr","url":"https://osv.dev/vulnerability/GHSA-m8f9-9whg-f4xr","summary":"Open WebUI has stored XSS via attacker-controlled file extension in /api/v1/audio/transcriptions","modified":"2026-07-13T16:43:15.862744117Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":["<0.9.3"],"fixed":["0.9.3"]}]},{"id":"PYSEC-2026-2748","url":"https://osv.dev/vulnerability/PYSEC-2026-2748","summary":"Open WebUI has stored XSS via attacker-controlled file extension in /api/v1/audio/transcriptions","modified":"2026-07-13T16:32:21.539006519Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":["<0.9.3"],"fixed":["0.9.3"]}]}],"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."]}