What is CVE-2026-45666?

CVE-2026-45666 is a medium-severity vulnerability in Open-webui, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-05-15.

How severe is CVE-2026-45666?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Open-webui

CVE-2026-45666

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.11, the API /api/v1/notes/{note_id} endpoint lacks proper authorization checks, allowing authenticated users to retrieve notes…

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.000 (10.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Open-webui — versions < 0.8.11
Openwebui Open_webui

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-45666?: CVE-2026-45666 is a medium-severity vulnerability in Open-webui, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-05-15.
How severe is CVE-2026-45666?: Medium severity. CVSS v3 base score is 6.5 out of 10.