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Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, a user just needs to use the API endpoint: /api/chat/completions with their own API key (generated in OWUI) and the Chat ID of another user to continue the conversation of the other user. This vulnerability is fixed in 0.9.0.

PUBLISHED Reserved 2026-05-11 | Published 2026-05-15 | Updated 2026-05-19 | Assigner GitHub_M




HIGH: 7.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Problem types

CWE-639: Authorization Bypass Through User-Controlled Key

Product status

< 0.9.0
affected

References

github.com/...-webui/security/advisories/GHSA-gfm2-xm6c-37qc exploit

github.com/...-webui/security/advisories/GHSA-gfm2-xm6c-37qc

cve.org (CVE-2026-45349)

nvd.nist.gov (CVE-2026-45349)

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