Critical
Security advisory
Symfony before 2.8.6 and 3.x before 3.0.6 allows remote attackers to bypass authentication by logging in with an empty password and valid username, which triggers an unauthenticated bind.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2016-2403
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:43 UTC · Revision 1
Source evidence
Symfony before 2.8.6 and 3.x before 3.0.6 allows remote attackers to bypass authentication by logging in with an empty password and valid username, which triggers an unauthenticated bind.
osv:CVE-2016-2403
Complete source record
{
"id": "b1d2e7bc7ecf4ba61d417117bbb7569610e8626c21ffd1e16d6663ed8baf901c",
"url": "https://osv.dev/vulnerability/CVE-2016-2403",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2016-2403",
"summary": "Symfony before 2.8.6 and 3.x before 3.0.6 allows remote attackers to bypass authentication by logging in with an empty password and valid username, which triggers an unauthenticated bind.",
"evidence": "osv:CVE-2016-2403",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2016-2403",
"aliases": [
"CVE-2016-2403",
"GHSA-wvj5-r78r-hhfq"
],
"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": [
{
"ranges": [
{
"repo": "https://github.com/symfony/security-http",
"type": "GIT",
"events": [
{
"introduced": "a8d5dd00894f8b5e3edb897f4504c51ddc442370"
},
{
"last_affected": "93431d2843a498bb3c1e84bae4cf8f321efd9e01"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:2.8.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.8.0"
},
{
"last_affected": "2.8.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:2.8.1:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.8.1"
},
{
"last_affected": "2.8.1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:2.8.2:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.8.2"
},
{
"last_affected": "2.8.2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:2.8.3:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.8.3"
},
{
"last_affected": "2.8.3"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:2.8.4:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.8.4"
},
{
"last_affected": "2.8.4"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:2.8.5:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.8.5"
},
{
"last_affected": "2.8.5"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:3.0.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.0"
},
{
"last_affected": "3.0.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:3.0.1:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.1"
},
{
"last_affected": "3.0.1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:3.0.2:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.2"
},
{
"last_affected": "3.0.2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:3.0.3:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.3"
},
{
"last_affected": "3.0.3"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:3.0.4:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.4"
},
{
"last_affected": "3.0.4"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:3.0.5:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.5"
},
{
"last_affected": "3.0.5"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"2.8.0",
"2.8.1",
"2.8.2",
"2.8.3",
"2.8.4",
"2.8.5",
"3.0.0",
"3.0.1",
"3.0.2",
"3.0.4",
"3.0.5"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-2403.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/symfony/symfony",
"type": "GIT",
"events": [
{
"introduced": "5615b92cd452cd54f1433a3f53de87c096a1107f"
},
{
"last_affected": "10c83b58fbb42be516377de54962a758695ad964"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:2.8.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.8.0"
},
{
"last_affected": "2.8.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:2.8.1:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.8.1"
},
{
"last_affected": "2.8.1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:2.8.2:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.8.2"
},
{
"last_affected": "2.8.2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:2.8.3:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.8.3"
},
{
"last_affected": "2.8.3"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:2.8.4:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.8.4"
},
{
"last_affected": "2.8.4"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:2.8.5:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.8.5"
},
{
"last_affected": "2.8.5"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:3.0.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.0"
},
{
"last_affected": "3.0.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:3.0.1:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.1"
},
{
"last_affected": "3.0.1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:3.0.2:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.2"
},
{
"last_affected": "3.0.2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:3.0.3:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.3"
},
{
"last_affected": "3.0.3"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:3.0.4:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.4"
},
{
"last_affected": "3.0.4"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:3.0.5:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.5"
},
{
"last_affected": "3.0.5"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"2.8.0",
"2.8.1",
"2.8.2",
"2.8.3",
"2.8.4",
"2.8.5",
"3.0.0",
"3.0.1",
"3.0.2",
"3.0.3",
"3.0.4",
"3.0.5"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-2403.json"
}
}
],
"modified": "2026-10-24T10:30:21.719944037Z",
"provider": "osv",
"references": [
"https://www.debian.org/security/2018/dsa-4262"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2016-2403",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 430539,
"published_at": "2017-02-07T17:59:00.303+00:00"
}