Medium
Open WebUI: Account enumeration via observable login timing discrepancy
Type: advisorySources: OSV
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, the /api/v1/auths/signin endpoint looked users up by email and only ran bcrypt password verification when a credential existed, making registered-account attempts measurably slower than missing-email attempts and allowing unauthenticated account enumeration. This issue is fixed in version 0.10.0.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-59218
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 12:01 UTC · Revision 1
Source evidence
Open WebUI: Account enumeration via observable login timing discrepancy
core-osv · Original sourcePublished 9 Jul 2026, 15:53 UTC
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, the /api/v1/auths/signin endpoint looked users up by email and only ran bcrypt password verification when a credential existed, making registered-account attempts measurably slower than missing-email attempts and allowing unauthenticated account enumeration. This issue is fixed in version 0.10.0.
osv:CVE-2026-59218
Complete source record
{
"id": "d7d4aa91ea341775d4219f32714e3eb3b7234bcf13c59b02f1a6f213565de915",
"url": "https://osv.dev/vulnerability/CVE-2026-59218",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Open WebUI: Account enumeration via observable login timing discrepancy",
"summary": "Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, the /api/v1/auths/signin endpoint looked users up by email and only ran bcrypt password verification when a credential existed, making registered-account attempts measurably slower than missing-email attempts and allowing unauthenticated account enumeration. This issue is fixed in version 0.10.0.",
"evidence": "osv:CVE-2026-59218",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-59218",
"aliases": [
"CVE-2026-59218",
"GHSA-7rw5-9f7q-xj36",
"PYSEC-2026-3594"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/open-webui/open-webui",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "4d2e13cf2bcc451b33bb6374bea4d2163e6cc94c"
},
{
"fixed": "993e74912199c66c522f08ec81abe31d76985e39"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "0.10.0"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "993e74912199c66c522f08ec81abe31d76985e39"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "4d2e13cf2bcc451b33bb6374bea4d2163e6cc94c"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v0.10.0"
}
]
}
}
],
"versions": [
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"v0.9.5",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59218.json"
}
}
],
"modified": "2026-10-28T02:30:35.131268438Z",
"provider": "osv",
"references": [
"https://github.com/open-webui/open-webui/releases/tag/v0.10.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59218.json",
"https://github.com/open-webui/open-webui/security/advisories/GHSA-7rw5-9f7q-xj36",
"https://nvd.nist.gov/vuln/detail/CVE-2026-59218",
"https://github.com/open-webui/open-webui/commit/993e74912199c66c522f08ec81abe31d76985e39",
"https://github.com/open-webui/open-webui/pull/26385"
],
"provider_metadata": {
"cwe_ids": [
"CWE-208"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59218.json"
}
},
"related_cves": [
{
"value": "CVE-2026-59218",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 502258,
"published_at": "2026-07-09T15:53:54.653+00:00"
}