Missing Authorization in Open WebUI - #VU131113
Published: May 12, 2026
Vulnerability identifier: #VU131113
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
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 attacker to cause a denial of service and incur usage costs.
The vulnerability exists due to missing authorization in the /api/v1/memories/ef endpoint when handling unauthenticated GET requests that invoke the embedding function. A remote attacker can send repeated requests to trigger embedding generation to cause a denial of service and incur usage costs.
Only instances with memory features enabled are vulnerable, and cost exposure occurs when a paid upstream embedding provider is configured.
Remediation
Install security update from vendor's website.