Improper access control in Open WebUI - #VU130170
Published: May 5, 2026
Vulnerability identifier: #VU130170
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Open WebUI
Affected software:
Open WebUI
Open WebUI
Detailed vulnerability description
The vulnerability allows a remote user to overwrite another user's knowledge base content and cause a denial of service.
The vulnerability exists due to improper access control in the retrieval web and YouTube processing endpoints when processing a user-supplied collection name with overwrite enabled. A remote user can send a specially crafted request targeting another user's collection to overwrite another user's knowledge base content and cause a denial of service.
Exploitation requires knowledge of the target collection name, and the overwrite behavior deletes the existing vector collection before writing attacker-controlled content.
Remediation
Install security update from vendor's website.