{"cve":"CVE-2026-70483","nvd":{"published":"2026-08-04T20:16:55.333","modified":"2026-09-18T14:46:24.803","status":"Analyzed","description":"Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.0, DELETE /api/v1/chats/{id} cancelled a chat's in-flight tasks before checking whether the caller could delete that chat. Any authenticated user who knew another user's chat id could abort that user's running model response, title generation, or tag generation, even though the delete was refused and no chat data was deleted, modified, or disclosed. This issue is fixed in 0.11.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","score":4.3},"cwes":["CWE-862"],"references":["https://github.com/open-webui/open-webui/commit/4f93c3e36c1734342a32c312bdb0516c66d8e93c","https://github.com/open-webui/open-webui/pull/27006","https://github.com/open-webui/open-webui/releases/tag/v0.11.0","https://github.com/open-webui/open-webui/security/advisories/GHSA-3vf6-64vr-3g56","https://github.com/open-webui/open-webui/security/advisories/GHSA-3vf6-64vr-3g56"],"products":["openwebui:open_webui"],"source":"nvd","synced_at":"2026-10-19T22:47:10.050265369+00:00"},"epss":{"cve":"CVE-2026-70483","score":0.00458,"percentile":0.39711,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-3vf6-64vr-3g56","url":"https://osv.dev/vulnerability/GHSA-3vf6-64vr-3g56","summary":"Open WebUI: Any authenticated user can cancel another user's chat generation via the chat delete endpoint","modified":"2026-08-10T11:40:48.240892715Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":[">=0.9.6 <0.11.0"],"fixed":["0.11.0"]}]},{"id":"PYSEC-2026-3640","url":"https://osv.dev/vulnerability/PYSEC-2026-3640","summary":"Open WebUI: Any authenticated user can cancel another user's chat generation via the chat delete endpoint","modified":"2026-08-10T11:30:14.381851446Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":[">=0.9.6 <0.11.0"],"fixed":["0.11.0"]}]}],"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."]}