CVE-2026-45666 json
Open WebUI: Indirect Object Reference (IDOR) in user notes
published 5mo ago modified 3mo ago also EUVD-2026-30647 , GHSA-x3qm-p8hr-3c3h , PYSEC-2026-2768
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 20%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi open-webui 0.8.11
- openwebui open_webui 0.8.11
Is CVE-2026-45666 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5mo ago
Exploit prediction
0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- github.com https://github.com/open-webui/open-webui/security/advisories/GHSA-x3qm-p8hr-3c3h referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| OSV | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | open-webui | <0.8.11 |
0.8.11 |
Affected products
- open-webui open-webui
Classification
- Weakness
-
- CWE-639 Authorization Bypass Through User-Controlled Key
References
-
github.com
/open-webui/open-webui/security/advisories/GHSA-x3qm-p8hr-3c3h
exploit, web, patch, vendor-advisory
-
github.com
/open-webui/open-webui/commit/de3317e26bb67a2a7ea015a183bbd1d369880ebd
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-45666
advisory
-
github.com
/open-webui/open-webui
package
-
github.com
/open-webui/open-webui/releases/tag/v0.8.11
web
-
pypi.org
/project/open-webui
package
-
github.com
/advisories/GHSA-x3qm-p8hr-3c3h
advisory
Sources
- CVE List CVE-2026-45666
- GitHub Advisory GHSA-x3qm-p8hr-3c3h
- NVD CVE-2026-45666
- OSV PYSEC-2026-2768
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.