What is CVE-2026-28788?

CVE-2026-28788 is a high-severity vulnerability in Open-webui, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.1/10. Published 2026-03-26.

How severe is CVE-2026-28788?

High severity. CVSS v3 base score is 7.1 out of 10.

Auth bypass in Open-webui

CVE-2026-28788

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.6, any authenticated user can overwrite any file's content by ID through the `POST /api/v1/retrieval/process/files/batc…

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.000 (5.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L.

Affected products

Open-webui — versions < 0.8.6

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-jjp7-g2jw-wh3j (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-28788?: CVE-2026-28788 is a high-severity vulnerability in Open-webui, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.1/10. Published 2026-03-26.
How severe is CVE-2026-28788?: High severity. CVSS v3 base score is 7.1 out of 10.