Auth bypass in Open-Webui
CVE-2026-109285
Open WebUI from 0.6.0 before 0.11.4 contains an improper access control vulnerability in has_access_to_file that lets former knowledge base collaborators keep file access via stale cached knowledge base references. Attackers with read or write grants can download removed files through the file content endpoint or delete them, including from the owner's private knowledge bases.
Vulnerability class: Broken Access Control
Published .
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/open-webui/open-webui/security/advisories/GHSA-9cxp-636w-4997 (vendor-advisory)
- www.vulncheck.com/advisories/open-webui-0.6.0-before-0.11.4-improper-access-con… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109285?
- CVE-2026-109285 is a medium-severity vulnerability in Open-Webui, classified under Incorrect Authorization. CVSS score: 5.0/10. Published 2026-10-12.
- How severe is CVE-2026-109285?
- Medium severity. CVSS v3 base score is 5.0 out of 10.