Missing Authorization in Open WebUI - #VU136840
Published: July 3, 2026
Vulnerability identifier: #VU136840
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-862
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 modify knowledge-base file membership.
The vulnerability exists due to improper access control in the upload auto-link path in file upload background processing when processing user-supplied upload metadata. A remote user can supply a crafted metadata.knowledge_id value during file upload to modify knowledge-base file membership.
The issue requires a verified account and a valid target knowledge-base ID. A user with read access but without write access to the target knowledge base can exploit it.
Remediation
Install security update from vendor's website.