HOMEVULNERABILITIESCVE-2026-45666
MEDIUM

CVE-2026-45666

CWE-639Published: May 15, 2026· Updated: May 19, 2026

6.5
CVSS v3.1
EPSS:0.03%probability of exploitation in 30 daysPercentile:8.6th

Official 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.

NVD Source

Technical Analysis

CVE-2026-45666 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

openwebui1 product
open webui
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/open-webui/open-webui/security/advisories/GHSA-x3qm-p8hr-3c3h
PATCHhttps://github.com/open-webui/open-webui/security/advisories/GHSA-x3qm-p8hr-3c3h

All References (2)

→
https://github.com/open-webui/open-webui/security/advisories/GHSA-x3qm-p8hr-3c3hExploit · Patch · Vendor Advisory
→
https://github.com/open-webui/open-webui/security/advisories/GHSA-x3qm-p8hr-3c3hExploit · Patch · Vendor Advisory

Quick Facts

CVE IDCVE-2026-45666
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-639
CISA KEVNo
EPSS (30d)0.03%
Affected1 vendor
PublishedMay 15, 2026

Related CVEs (CWE-639)

CVE-2026-29200
9.9
CVE-2026-33511
9.8
CVE-2019-25487
9.8
CVE-2018-25270
9.8
CVE-2026-41267
9.8
CVE-2026-24178
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-45666 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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CVE-2026-45666 — CVSS 6.5 MEDIUM | CTIWATCH.COM