What is CVE-2026-45402?

CVE-2026-45402 is a high-severity vulnerability in Open-webui, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.1/10. Published 2026-05-15.

How severe is CVE-2026-45402?

High severity. CVSS v3 base score is 8.1 out of 10.

Auth bypass in Open-webui

CVE-2026-45402

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, multiple endpoints accept a user-supplied file_id and attach the referenced file to a resource the caller controls (folder k…

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.000 (1.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

Open-webui — versions < 0.9.5
Openwebui Open_webui

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

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

Frequently asked questions

What is CVE-2026-45402?: CVE-2026-45402 is a high-severity vulnerability in Open-webui, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.1/10. Published 2026-05-15.
How severe is CVE-2026-45402?: High severity. CVSS v3 base score is 8.1 out of 10.