Medium severity · published May 15, 2026
CVE-2026-45365
Open WebUI: Authenticated users can bypass model access control via exposed query parameter
5.4
CVSS
0.2%
EPSS
No
On KEV
Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.11, an internal-only bypass_filter parameter is exposed on the /openai/chat/completions and /ollama/api/chat HTTP endpoints via FastAPI query string binding, allowing any authenticated user to append ?bypass_filter=true and bypass model access control checks to invoke admin-restricted models. This vulnerability is fixed in 0.8.11.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
open-webui · open-webui
< 0.8.11 · source: vendor
OW
Open Webui · Openwebui
before 0.8.11 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45365
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45365
Exploit
https://github.com/open-webui/open-webui/security/advisories/GHSA-v6qf-75pr-p96m
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