Open WebUI: Ollama Model Access Control Bypass via /api/generate, /api/embed, /api/embeddings, and /api/show
Published May 15, 2026
5.4
MEDIUMCVSS 3.1
EPSS 0.34%
Description
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.
Affected products
-
- Version < 0.9.0StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Open-Webui | Open-Webui | n/a |
|
- < 0.9.0
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed May 18, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
May–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.34% (0.00343) | 25.55th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.24% (0.00238) | 14.55th | v5 (v2026.06.15) |
| May 16, 2026 | 0.03% (0.00034) | 10.09th | v4 (v2025.03.14) |
References (3)
- https://github.com/advisories/GHSA-rcvp-6fgw-c7fh Advisory
- https://github.com/open-webui/open-webui/security/advisories/GHSA-rcvp-6fgw-c7fh x_refsource_CONFIRMExploitVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-44563
| Link | Providers | Tags |
|---|---|---|
| https://github.com/advisories/GHSA-rcvp-6fgw-c7fh | Advisory | |
| https://github.com/open-webui/open-webui/security/advisories/GHSA-rcvp-6fgw-c7fh | x_refsource_CONFIRMExploitVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-44563 |
Change history (0)
No recorded changes yet.