Critical
Symfony: Identity Spoofing via Unanchored DN Regex in X509Authenticator
Type: advisorySources: OSV
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, X509Authenticator extracts the user identifier from $_SERVER['SSL_CLIENT_S_DN'] with an unanchored regex that matches emailAddress= anywhere in the distinguished name, allowing an attacker with a trusted certificate containing emailAddress=victim inside another RDN value such as CN to authenticate as the victim. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-45063
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 01:32 UTC · Revision 1
Source evidence
Symfony: Identity Spoofing via Unanchored DN Regex in X509Authenticator
core-osv · Original sourcePublished 14 Jul 2026, 18:28 UTC
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, X509Authenticator extracts the user identifier from $_SERVER['SSL_CLIENT_S_DN'] with an unanchored regex that matches emailAddress= anywhere in the distinguished name, allowing an attacker with a trusted certificate containing emailAddress=victim inside another RDN value such as CN to authenticate as the victim. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.
osv:CVE-2026-45063
Complete source record
{
"id": "219d2a172f80bd3c112e9d49f127b269ba87c06412165ab6b589f923915e53fe",
"url": "https://osv.dev/vulnerability/CVE-2026-45063",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Symfony: Identity Spoofing via Unanchored DN Regex in X509Authenticator",
"summary": "Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, X509Authenticator extracts the user identifier from $_SERVER['SSL_CLIENT_S_DN'] with an unanchored regex that matches emailAddress= anywhere in the distinguished name, allowing an attacker with a trusted certificate containing emailAddress=victim inside another RDN value such as CN to authenticate as the victim. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.",
"evidence": "osv:CVE-2026-45063",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2026-45063",
"aliases": [
"CVE-2026-45063",
"GHSA-ph86-p8f6-f9r2"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
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"database_specific": {
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}
}
],
"modified": "2026-10-28T02:30:41.127331973Z",
"provider": "osv",
"references": [
"https://github.com/symfony/symfony/releases/tag/v5.4.52",
"https://github.com/symfony/symfony/releases/tag/v6.4.40",
"https://github.com/symfony/symfony/releases/tag/v7.4.12",
"https://github.com/symfony/symfony/releases/tag/v8.0.12",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45063.json",
"https://github.com/symfony/symfony/security/advisories/GHSA-ph86-p8f6-f9r2",
"https://nvd.nist.gov/vuln/detail/CVE-2026-45063",
"https://github.com/symfony/symfony/commit/59ef484029601a7af06f5e06c6ed921fdcea5a0d"
],
"provider_metadata": {
"cwe_ids": [
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],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45063.json"
}
},
"related_cves": [
{
"value": "CVE-2026-45063",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 509090,
"published_at": "2026-07-14T18:28:22.074+00:00"
}