Critical
Security advisory
An issue was discovered in the Ldap component in Symfony 2.8.x before 2.8.37, 3.3.x before 3.3.17, 3.4.x before 3.4.7, and 4.0.x before 4.0.7. It allows remote attackers to bypass authentication by logging in with a "null" password and valid username, which triggers an unauthenticated bind. NOTE: this issue exists because of an incomplete fix for CVE-2016-2403.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-11407
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:49 UTC · Revision 1
Source evidence
An issue was discovered in the Ldap component in Symfony 2.8.x before 2.8.37, 3.3.x before 3.3.17, 3.4.x before 3.4.7, and 4.0.x before 4.0.7. It allows remote attackers to bypass authentication by logging in with a "null" password and valid username, which triggers an unauthenticated bind. NOTE: this issue exists because of an incomplete fix for CVE-2016-2403.
osv:CVE-2018-11407
Complete source record
{
"id": "907352ce6994cd56b4be1ae748c6f0ea0c864a287675d36d9bd6140a83ae25f0",
"url": "https://osv.dev/vulnerability/CVE-2018-11407",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-11407",
"summary": "An issue was discovered in the Ldap component in Symfony 2.8.x before 2.8.37, 3.3.x before 3.3.17, 3.4.x before 3.4.7, and 4.0.x before 4.0.7. It allows remote attackers to bypass authentication by logging in with a \"null\" password and valid username, which triggers an unauthenticated bind. NOTE: this issue exists because of an incomplete fix for CVE-2016-2403.",
"evidence": "osv:CVE-2018-11407",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2018-11407",
"aliases": [
"CVE-2018-11407",
"GHSA-35c5-28pg-2qg4"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
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"repo": "https://github.com/symfony/security-http",
"type": "GIT",
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{
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{
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{
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{
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{
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],
"source": "CPE_RANGE"
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{
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"range": [
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{
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}
],
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}
]
}
}
],
"versions": [
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"v2.8.16",
"v2.8.15",
"v2.8.14",
"v2.8.13",
"v2.8.12",
"v2.8.11",
"v2.8.10",
"v2.8.9",
"v2.8.8",
"v2.8.7",
"v2.8.6",
"v2.8.5",
"v2.8.4",
"v2.8.3",
"v2.8.2",
"v2.8.1",
"v2.8.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-11407.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/symfony/symfony",
"type": "GIT",
"events": [
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{
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{
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{
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{
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{
"fixed": "eb07b0eab0bda8441fbf94d06ad1f9896e0552cc"
},
{
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{
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],
"database_specific": {
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{
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{
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}
],
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},
{
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{
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{
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{
"cpe": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*",
"range": [
{
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},
{
"fixed": "4.0.7"
}
],
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}
]
}
}
],
"versions": [
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],
"database_specific": {
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}
}
],
"modified": "2026-10-24T10:30:58.894471538Z",
"provider": "osv",
"references": [
"https://symfony.com/blog/cve-2018-11407-unauthorized-access-on-a-misconfigured-ldap-server-when-using-an-empty-password"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2018-11407",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 439189,
"published_at": "2018-06-13T16:29:01.047+00:00"
}