Medium
Open WebUI: Ollama Model Access Control Bypass via /api/generate, /api/embed, /api/embeddings, and /api/show
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-44563
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 02:05 UTC · Revision 1
Source evidence
Open WebUI: Ollama Model Access Control Bypass via /api/generate, /api/embed, /api/embeddings, and /api/show
core-osv · Original sourcePublished 15 May 2026, 19:28 UTC
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.
osv:CVE-2026-44563
Complete source record
{
"id": "7d5d68344794298a955b53d8a9274ec8dcb7c429ddabc615c4482b2b2412b845",
"url": "https://osv.dev/vulnerability/CVE-2026-44563",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Open WebUI: Ollama Model Access Control Bypass via /api/generate, /api/embed, /api/embeddings, and /api/show",
"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.",
"evidence": "osv:CVE-2026-44563",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-44563",
"aliases": [
"CVE-2026-44563",
"GHSA-rcvp-6fgw-c7fh",
"PYSEC-2026-2754"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/open-webui/open-webui",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "f31768e20e5c6b4f6da0ef657877298b359936cf"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "0.9.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"cpe": "cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "0.9.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v0.8.12",
"v0.8.11",
"v0.8.10",
"v0.8.9",
"v0.8.8",
"v0.8.7",
"v0.8.6",
"v0.8.5",
"v0.8.4",
"v0.8.3",
"v0.8.2",
"v0.8.1",
"v0.8.0",
"v0.7.2",
"v0.7.1",
"v0.7.0",
"v0.6.43",
"v0.6.42",
"v0.6.41",
"v0.6.40",
"v0.6.39",
"v0.6.38",
"v0.6.37",
"v0.6.36",
"v0.6.34",
"v0.6.35",
"v0.6.33",
"v0.6.32",
"v0.6.31",
"v0.6.30",
"v0.6.29",
"v0.6.28",
"v0.6.27",
"v0.6.26",
"v0.6.25",
"v0.6.24",
"v0.6.23",
"v0.6.22",
"v0.6.21",
"v0.6.20",
"v0.6.19",
"v0.6.18",
"v0.6.17",
"v0.6.16",
"v0.6.15",
"v0.6.14",
"v0.6.13",
"v0.6.12",
"v0.6.11",
"v0.6.10",
"v0.6.9",
"v0.6.8",
"v0.6.7",
"v0.6.6",
"v0.6.5",
"v0.6.4",
"v0.6.3",
"v0.6.2",
"v0.6.1",
"v0.6.0",
"v0.5.16",
"v0.5.20",
"v0.5.19",
"v0.5.18",
"v0.5.17",
"v0.5.15",
"v0.5.14",
"v0.5.12",
"v0.5.13",
"v0.5.11",
"v0.5.10",
"v0.5.9",
"v0.5.8",
"v0.5.7",
"v0.5.6",
"v0.5.5",
"v0.5.4",
"v0.5.3",
"v0.5.2",
"v0.5.1",
"v0.5.0",
"v0.4.8",
"v0.4.7",
"v0.4.6",
"v0.4.5",
"v0.4.4",
"v0.4.3",
"v0.4.2",
"v0.4.1",
"v0.4.0",
"v0.3.35",
"v0.3.34",
"v0.3.33",
"v0.3.32",
"v0.3.31",
"v0.3.30",
"v0.3.29",
"v0.3.28",
"v0.3.27",
"v0.3.26",
"v0.3.25",
"v0.3.24",
"v0.3.23",
"v0.3.22",
"v0.3.21",
"v0.3.20",
"v0.3.19",
"v0.3.18",
"v0.3.17",
"v0.3.16",
"v0.3.15",
"v0.3.14",
"v0.3.13",
"v0.3.12",
"v0.3.11",
"v0.3.10",
"v0.3.9",
"v0.3.8",
"v0.3.7",
"v0.3.6",
"v0.3.5",
"v0.3.4",
"v0.3.3",
"v0.3.2",
"v0.3.1",
"v0.3.0",
"v0.2.5",
"v0.2.4",
"v0.2.3",
"v0.2.2",
"v0.2.1",
"v0.2.0",
"v0.1.125",
"v0.1.124",
"v0.1.123",
"v0.1.122",
"v0.1.114",
"v0.1.121",
"v0.1.120",
"v0.1.119",
"v0.1.118",
"v0.1.117",
"v0.1.116",
"v0.1.115",
"v0.1.108",
"v0.1.113",
"v0.1.112",
"v0.1.111",
"v0.1.110",
"v0.1.109",
"v0.1.107",
"v0.1.106",
"v0.1.105",
"v0.1.104",
"v0.1.103",
"v0.1.102"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44563.json"
}
}
],
"modified": "2026-10-28T02:30:32.551829111Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44563.json",
"https://github.com/open-webui/open-webui/security/advisories/GHSA-rcvp-6fgw-c7fh",
"https://nvd.nist.gov/vuln/detail/CVE-2026-44563"
],
"provider_metadata": {
"cwe_ids": [
"CWE-862"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44563.json"
}
},
"related_cves": [
{
"value": "CVE-2026-44563",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 499538,
"published_at": "2026-05-15T19:28:25.27+00:00"
}