Medium
ZITADEL has a user enumeration vulnerability in Login UIs
Type: advisorySources: OSV
ZITADEL is an open source identity management platform. Prior to 4.9.1 and 3.4.6, a user enumeration vulnerability has been discovered in Zitadel's login interfaces. An unauthenticated attacker can exploit this flaw to confirm the existence of valid user accounts by iterating through usernames and userIDs. This vulnerability is fixed in 4.9.1 and 3.4.6.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-23511
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 08:23 UTC · Revision 1
Source evidence
ZITADEL has a user enumeration vulnerability in Login UIs
core-osv · Original sourcePublished 15 Jan 2026, 19:09 UTC
ZITADEL is an open source identity management platform. Prior to 4.9.1 and 3.4.6, a user enumeration vulnerability has been discovered in Zitadel's login interfaces. An unauthenticated attacker can exploit this flaw to confirm the existence of valid user accounts by iterating through usernames and userIDs. This vulnerability is fixed in 4.9.1 and 3.4.6.
osv:CVE-2026-23511
Complete source record
{
"id": "36f73d6f03b418dc6bbf71454b1c9b648fc610b866732bf4a6dc48267b2b89dd",
"url": "https://osv.dev/vulnerability/CVE-2026-23511",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ZITADEL has a user enumeration vulnerability in Login UIs",
"summary": "ZITADEL is an open source identity management platform. Prior to 4.9.1 and 3.4.6, a user enumeration vulnerability has been discovered in Zitadel's login interfaces. An unauthenticated attacker can exploit this flaw to confirm the existence of valid user accounts by iterating through usernames and userIDs. This vulnerability is fixed in 4.9.1 and 3.4.6.",
"evidence": "osv:CVE-2026-23511",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-23511",
"aliases": [
"CVE-2026-23511",
"GHSA-pvm5-9frx-264r",
"GO-2026-4319"
],
"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/zitadel/zitadel",
"type": "GIT",
"events": [
{
"introduced": "5b284f8c9ba65a88fb4d58ac6aa34be429b19e8e"
},
{
"last_affected": "85122bd18b310ea8d6578c07e1cf07698ee28055"
},
{
"introduced": "573c96d6af6aa8778efd9bff59f9bc0dab94c495"
},
{
"fixed": "afe594c3498d9e4c67039f0b3b18e799dcbdb07b"
},
{
"introduced": "c86c60bab86b64b44755d2776703939c01686055"
},
{
"fixed": "d08f14c513715676195d5d671b5b65664abd5759"
},
{
"fixed": "b85ab69e4679b0268e2b0e9b4cd04e934af10dd2"
},
{
"fixed": "c300d4cc6a2775ab17ddfe76492f24170f8b858d"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.0.0"
},
{
"last_affected": "2.71.19"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.0"
},
{
"fixed": "3.4.6"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.0.0"
},
{
"fixed": "4.9.1"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "b85ab69e4679b0268e2b0e9b4cd04e934af10dd2"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "c300d4cc6a2775ab17ddfe76492f24170f8b858d"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "afe594c3498d9e4c67039f0b3b18e799dcbdb07b"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v3.4.6"
},
{
"range": [
{
"fixed": "d08f14c513715676195d5d671b5b65664abd5759"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v4.9.1"
}
]
}
}
],
"versions": [
"v4.9.0",
"v3.4.5",
"v4.8.1",
"v4.8.0",
"v4.7.6",
"v4.7.5",
"v4.7.4",
"v4.7.3",
"v4.7.2",
"v3.4.4",
"v4.7.1",
"v4.7.0",
"v4.6.6",
"v2.71.19",
"v4.6.5",
"v2.71.18",
"v3.4.3",
"v4.6.4",
"v4.6.3",
"v4.6.2",
"v4.6.1",
"v4.6.0",
"v2.71.17",
"v3.4.2",
"v4.5.0",
"v4.4.0",
"v4.3.3",
"v4.3.2",
"v4.3.1",
"v4.3.0",
"v4.2.2",
"v4.2.1",
"v2.71.16",
"v4.2.0",
"v4.1.4",
"v4.1.3",
"v3.4.1",
"v4.1.2",
"v4.1.1",
"v4.1.0",
"v3.4.0",
"v2.71.15",
"v4.0.3",
"v4.0.2",
"v3.3.6",
"v4.0.1",
"v2.71.14",
"v3.3.5",
"v3.3.4",
"v3.3.3",
"v3.3.2",
"v4.0.0",
"v2.71.13",
"v2.71.12",
"v3.3.1",
"v3.3.0",
"v3.2.3",
"v3.2.2",
"v2.71.11",
"v3.2.1",
"v3.2.0",
"v3.1.0",
"v3.0.4",
"v2.71.10",
"v3.0.3",
"v2.71.9",
"v3.0.2",
"v3.0.1",
"v3.0.0",
"v2.71.8",
"v2.71.7",
"v2.71.6",
"v2.71.5",
"v2.71.4",
"v2.71.3",
"v2.71.2",
"v2.71.1",
"v2.70.1",
"v2.71.0",
"v2.70.0",
"v2.69.3",
"v2.69.2",
"v2.69.1",
"v2.69.0",
"v2.68.1",
"v2.67.4",
"v2.68.0",
"v2.67.3",
"v2.67.2",
"v2.67.1",
"v2.67.0",
"v2.66.3",
"v2.66.2",
"v2.66.1",
"v2.66.0",
"v2.65.4",
"v2.65.3",
"v2.65.2",
"v2.65.1",
"v2.65.0",
"v2.64.1",
"v2.64.0",
"v2.63.4",
"v2.63.3",
"v2.63.2",
"v2.63.1",
"v2.63.0",
"v2.62.3",
"v2.62.2",
"v2.62.1",
"v2.62.0",
"v2.61.0",
"v2.59.1",
"v2.60.0",
"v2.58.3",
"v2.59.0",
"v2.58.2",
"v2.58.1",
"v2.56.1",
"v2.58.0",
"v2.57.0",
"v2.56.0",
"v2.55.2",
"v2.55.1",
"v2.55.0",
"v2.54.3",
"v2.54.2",
"v2.54.1",
"v2.54.0",
"v2.53.2",
"v2.53.1",
"v2.52.1",
"v2.53.0",
"v2.52.0",
"v2.51.4",
"v2.51.3",
"v2.51.2",
"v2.50.5",
"v2.51.1",
"v2.51.0",
"v2.50.4",
"v2.50.3",
"v2.50.2",
"v2.49.3",
"v2.48.3",
"v2.50.1",
"v2.50.0",
"v2.49.2",
"v2.49.1",
"v2.49.0",
"v2.48.2",
"v2.48.1",
"v2.47.6",
"v2.48.0",
"v2.47.5",
"v2.47.4",
"v2.47.3",
"v2.47.2",
"v2.46.0",
"v2.45.0",
"v2.44.2",
"v2.47.1",
"v2.47.0",
"v2.44.1",
"v2.44.0",
"v2.43.5",
"v2.43.4",
"v2.43.3",
"v2.43.2",
"v2.43.1",
"v2.43.0",
"v2.42.3",
"v2.42.2",
"v2.42.1",
"v2.42.0",
"v2.41.5",
"v2.41.4",
"v2.41.3",
"v2.41.2",
"v2.40.5",
"v2.41.1",
"v2.41.0",
"v2.40.4",
"v2.40.3",
"v2.39.3",
"v2.40.2",
"v2.40.1",
"v2.40.0",
"v2.39.2",
"v2.38.1",
"v2.39.1",
"v2.39.0",
"v2.38.0",
"v2.37.3",
"v2.37.2",
"v2.37.1",
"v2.37.0",
"v2.36.3",
"v2.36.2",
"v2.36.1",
"v2.36.0",
"v2.35.1",
"v2.35.0",
"v2.34.1",
"v2.32.0",
"v2.34.0",
"v2.33.1",
"v2.33.0",
"v2.31.5",
"v2.31.4",
"v2.31.3",
"v2.31.2",
"v2.31.1",
"v2.31.0",
"v2.30.0",
"v2.29.3",
"v2.29.2",
"v2.29.1",
"v2.29.0",
"v2.28.1",
"v2.27.1",
"v2.28.0",
"v2.27.0",
"v2.26.2",
"v2.26.1",
"v2.26.0",
"v2.25.3",
"v2.25.2",
"v2.25.1",
"v2.25.0",
"v2.24.0",
"v2.23.1",
"v2.23.0",
"v2.22.2",
"v2.22.1",
"v2.22.0",
"v2.21.0",
"v2.20.0",
"2.20.0",
"v2.19.0",
"v2.18.0",
"v2.17.1",
"v2.17.0",
"v2.16.1",
"v2.16.0",
"v2.15.0",
"v2.14.5",
"v2.14.4",
"v2.14.3",
"v2.14.2",
"v2.14.1",
"v2.14.0",
"v2.13.1",
"v2.13.0",
"v2.12.0",
"v2.11.1",
"v2.11.0",
"v2.8.2",
"v2.10.0",
"v2.9.1",
"v2.9.0",
"v2.8.1",
"v2.8.0",
"v2.7.0",
"v2.6.0",
"v2.5.1",
"v2.5.0",
"v2.4.0",
"v2.3.4",
"v2.3.3",
"v2.3.2",
"v2.3.1",
"v2.3.0",
"v2.2.0",
"v2.1.1",
"v2.1.0",
"v2.0.1",
"v2.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23511.json"
}
}
],
"modified": "2026-10-28T02:30:27.472982300Z",
"provider": "osv",
"references": [
"https://github.com/zitadel/zitadel/releases/tag/v3.4.6",
"https://github.com/zitadel/zitadel/releases/tag/v4.9.1",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23511.json",
"https://github.com/zitadel/zitadel/security/advisories/GHSA-pvm5-9frx-264r",
"https://nvd.nist.gov/vuln/detail/CVE-2026-23511",
"https://github.com/zitadel/zitadel/commit/b85ab69e4679b0268e2b0e9b4cd04e934af10dd2",
"https://github.com/zitadel/zitadel/commit/c300d4cc6a2775ab17ddfe76492f24170f8b858d"
],
"provider_metadata": {
"cwe_ids": [
"CWE-204"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23511.json"
}
},
"related_cves": [
{
"value": "CVE-2026-23511",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 493740,
"published_at": "2026-01-15T19:09:06.154+00:00"
}