Medium severity · published May 15, 2026
CVE-2026-45666
Open WebUI: Indirect Object Reference (IDOR) in user notes
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.11, the API /api/v1/notes/{note_id} endpoint lacks proper authorization checks, allowing authenticated users to retrieve notes belonging to other users by guessing or enumerating UUIDs. This results in unauthorized disclosure of potentially sensitive or private user data. This vulnerability is fixed in 0.8.11.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% 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-2026-45666
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45666
Exploit
https://github.com/open-webui/open-webui/security/advisories/GHSA-x3qm-p8hr-3c3h
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