CVE-2026-45365 json
Open WebUI: Authenticated users can bypass model access control via exposed query parameter
published 2026-05-14 5 mo ago modified 2026-07-13 3 mo ago also EUVD-2026-30649 , GHSA-v6qf-75pr-p96m , PYSEC-2026-2758
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 9%
- 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, 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.
Patch / fix
- pypi open-webui 0.8.11
- openwebui open_webui 0.8.11
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.19% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/open-webui/open-webui/security/advisories/GHSA-v6qf-75pr-p96m referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N |
| GitHub | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N |
| OSV | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/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-285 Improper Authorization
References
-
github.com
/open-webui/open-webui/security/advisories/GHSA-v6qf-75pr-p96m
exploit, web, patch, vendor-advisory
-
github.com
/open-webui/open-webui/commit/c0385f60ba049da48d2d5452068586d375303c37
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-45365
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-v6qf-75pr-p96m
advisory
Sources
- CVE List CVE-2026-45365
- GitHub Advisory GHSA-v6qf-75pr-p96m
- NVD CVE-2026-45365
- OSV PYSEC-2026-2758
Fencer Vulns 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.