{"cve":"CVE-2026-87015","nvd":{"published":"2026-09-09T21:17:06.463","modified":"2026-09-15T15:54:14.750","status":"Analyzed","description":"Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.27 until 0.11.1, backend/open_webui/utils/tools.py captured a cookie jar from the enclosing connection loop instead of binding it to each external tool callable. When multiple tool servers were attached and a session or system OAuth connection was processed last, a request to a different server configured for bearer authentication could include the calling user's Open WebUI session cookies, allowing that server's operator to reuse the session and take over the account. This issue is fixed in version 0.11.1.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","score":6.8},"cwes":["CWE-201"],"references":["https://github.com/open-webui/open-webui/commit/cd9db21c5276807a2975ddba17cef369ad1114b7","https://github.com/open-webui/open-webui/pull/28630","https://github.com/open-webui/open-webui/releases/tag/v0.11.1","https://github.com/open-webui/open-webui/security/advisories/GHSA-p78m-89r6-pgf7","https://github.com/open-webui/open-webui/security/advisories/GHSA-p78m-89r6-pgf7"],"products":["openwebui:open_webui"],"source":"nvd","synced_at":"2026-10-19T22:52:53.108888569+00:00"},"epss":{"cve":"CVE-2026-87015","score":0.00478,"percentile":0.41264,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-p78m-89r6-pgf7","url":"https://osv.dev/vulnerability/GHSA-p78m-89r6-pgf7","summary":"Open WebUI: A user's session cookies are sent to tool servers configured for bearer authentication","modified":"2026-10-01T17:56:07.397158609Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":[">=0.6.27 <0.11.1"],"fixed":["0.11.1"]}]},{"id":"PYSEC-2026-4124","url":"https://osv.dev/vulnerability/PYSEC-2026-4124","summary":"Open WebUI: A user's session cookies are sent to tool servers configured for bearer authentication","modified":"2026-10-01T17:45:13.661695416Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":[">=0.6.27 <0.11.1"],"fixed":["0.11.1"]}]}],"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."]}