CVE-2026-44563 json
Open WebUI: Ollama Model Access Control Bypass via /api/generate, /api/embed, /api/embeddings, and /api/show
published 2026-05-08 6 mo ago modified 2026-07-13 3 mo ago also GHSA-rcvp-6fgw-c7fh , PYSEC-2026-2754 , EUVD-2026-30614
- 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 14%
- public exploits
- 0
- none known
Summary
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the /api/generate, /api/embed, /api/embeddings, and /api/show endpoints accept any model name from the user and forward the request to the Ollama backend without checking whether the user is authorized to access that model. These endpoints only require get_verified_user (any authenticated non-pending user) and validate that the model exists in the full unfiltered model list, but never check AccessGrants.has_access(). This vulnerability is fixed in 0.9.0.
Patch / fix
- pypi open-webui 0.9.0
- openwebui open_webui 0.9.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/open-webui/open-webui/security/advisories/GHSA-rcvp-6fgw-c7fh 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:N/A:L |
| OSV | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L |
| GitHub | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | open-webui | <0.9.0 |
0.9.0 |
Affected products
- open-webui open-webui
Classification
- Weakness
-
- CWE-862 Missing Authorization
References
-
github.com
/open-webui/open-webui/security/advisories/GHSA-rcvp-6fgw-c7fh
web, exploit, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-44563
advisory
-
github.com
/open-webui/open-webui
package
-
pypi.org
/project/open-webui
package
-
github.com
/advisories/GHSA-rcvp-6fgw-c7fh
advisory
Sources
- CVE List CVE-2026-44563
- GitHub Advisory GHSA-rcvp-6fgw-c7fh
- NVD CVE-2026-44563
- OSV PYSEC-2026-2754
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