simplesamlphp — security advisory
The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions 4.19.3, 4.20.2, 5.0.6, and 6.2.1, the HTTPArtifact::receive() flow can treat an unsigned embedded SAML Response as cryptographically valid for the wrong identity provider. SOAPClient::addSSLValidator() attaches a TLS-based validator to the outer SOAP ArtifactResponse, while the embedded Response receives a validator that delegates to the outer message and is later checked against metadata selected from the embedded response issuer rather than necessarily the artifact issuer. SOAPClient::validateSSL() returns normally when the TLS public key does not match the key being validated, and SAML2\Message::validate() treats a validator call that does not throw as successful. In a multi-IdP federation, a malicious or lower-trust IdP can therefore provide an ArtifactResponse containing an unsigned Response that claims a higher-trust victim IdP as issuer and authenticate as arbitrary users with attacker-chosen assertion attributes, NameID, and session data. This issue is fixed in versions 4.19.3, 4.20.2, 5.0.6, and 6.2.1.
- Products
- simplesamlphp
- Affected versions
- 1.13.2-1, 1.14.0-1, 1.14.0-1ubuntu2, 1.14.0-1ubuntu2+esm1, 1.14.15-1, 1.15.0-1, 1.15.1-1, 1.15.2-1, 1.15.3-1, 1.15.3-1ubuntu0.1~esm1, 1.17.5-1, 1.17.6-1, 1.17.6-2, 1.18.1-1, 1.18.4-1, 1.18.4-1ubuntu0.1~esm1, 1.19.1-1, 1.19.1-1.1, 1.19.1-1.1ubuntu0.1~esm1, 1.19.7-1, 1.19.7-1+deb12u1ubuntu0.1, 1.19.7-2, 2.1.8-0.1, 2.2.6-1, 2.3.11-1, 2.3.11-2, 2.4.8-1, 2.5.3.1-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-49283
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:25 UTC · Revision 1
Source evidence
The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions 4.19.3, 4.20.2, 5.0.6, and 6.2.1, the HTTPArtifact::receive() flow can treat an unsigned embedded SAML Response as cryptographically valid for the wrong identity provider. SOAPClient::addSSLValidator() attaches a TLS-based validator to the outer SOAP ArtifactResponse, while the embedded Response receives a validator that delegates to the outer message and is later checked against metadata selected from the embedded response issuer rather than necessarily the artifact issuer. SOAPClient::validateSSL() returns normally when the TLS public key does not match the key being validated, and SAML2\Message::validate() treats a validator call that does not throw as successful. In a multi-IdP federation, a malicious or lower-trust IdP can therefore provide an ArtifactResponse containing an unsigned Response that claims a higher-trust victim IdP as issuer and authenticate as arbitrary users with attacker-chosen assertion attributes, NameID, and session data. This issue is fixed in versions 4.19.3, 4.20.2, 5.0.6, and 6.2.1.
osv:UBUNTU-CVE-2026-49283
simplesamlphp
Fixed versions: Not specified
simplesamlphp
Fixed versions: Not specified
simplesamlphp
Fixed versions: Not specified
simplesamlphp
Fixed versions: Not specified
simplesamlphp
Fixed versions: Not specified
simplesamlphp
Fixed versions: Not specified
simplesamlphp
Fixed versions: Not specified
Complete source record
{
"id": "cdebe356ed3c76699ea6c242a99815df960efa9f3e796aedabba7912c1e7007f",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-49283",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-49283",
"summary": "The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions 4.19.3, 4.20.2, 5.0.6, and 6.2.1, the HTTPArtifact::receive() flow can treat an unsigned embedded SAML Response as cryptographically valid for the wrong identity provider. SOAPClient::addSSLValidator() attaches a TLS-based validator to the outer SOAP ArtifactResponse, while the embedded Response receives a validator that delegates to the outer message and is later checked against metadata selected from the embedded response issuer rather than necessarily the artifact issuer. SOAPClient::validateSSL() returns normally when the TLS public key does not match the key being validated, and SAML2\\Message::validate() treats a validator call that does not throw as successful. In a multi-IdP federation, a malicious or lower-trust IdP can therefore provide an ArtifactResponse containing an unsigned Response that claims a higher-trust victim IdP as issuer and authenticate as arbitrary users with attacker-chosen assertion attributes, NameID, and session data. This issue is fixed in versions 4.19.3, 4.20.2, 5.0.6, and 6.2.1.",
"evidence": "osv:UBUNTU-CVE-2026-49283",
"products": [
{
"name": {
"value": "simplesamlphp",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.13.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.14.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.14.0-1ubuntu2",
"evidence": "/affected/0/versions"
},
{
"value": "1.14.0-1ubuntu2+esm1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "simplesamlphp",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.14.15-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.15.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.15.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.15.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.15.3-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.15.3-1ubuntu0.1~esm1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "simplesamlphp",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.17.5-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.17.6-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.17.6-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.18.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.18.4-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.18.4-1ubuntu0.1~esm1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "simplesamlphp",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.19.1-1",
"evidence": "/affected/3/versions"
},
{
"value": "1.19.1-1.1",
"evidence": "/affected/3/versions"
},
{
"value": "1.19.1-1.1ubuntu0.1~esm1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "simplesamlphp",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.19.7-1",
"evidence": "/affected/4/versions"
},
{
"value": "1.19.7-1+deb12u1ubuntu0.1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "simplesamlphp",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.19.7-2",
"evidence": "/affected/5/versions"
},
{
"value": "2.1.8-0.1",
"evidence": "/affected/5/versions"
},
{
"value": "2.2.6-1",
"evidence": "/affected/5/versions"
},
{
"value": "2.3.11-1",
"evidence": "/affected/5/versions"
},
{
"value": "2.3.11-2",
"evidence": "/affected/5/versions"
},
{
"value": "2.4.8-1",
"evidence": "/affected/5/versions"
},
{
"value": "2.5.3.1-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "simplesamlphp",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.19.7-2",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-49283",
"aliases": [
"UBUNTU-CVE-2026-49283"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "simplesamlphp",
"purl": "pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps-legacy%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"1.13.2-1",
"1.14.0-1",
"1.14.0-1ubuntu2",
"1.14.0-1ubuntu2+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49283.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "simplesamlphp",
"binary_version": "1.14.0-1ubuntu2+esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "simplesamlphp",
"purl": "pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"1.14.15-1",
"1.15.0-1",
"1.15.1-1",
"1.15.2-1",
"1.15.3-1",
"1.15.3-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49283.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "simplesamlphp",
"binary_version": "1.15.3-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "simplesamlphp",
"purl": "pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"1.17.5-1",
"1.17.6-1",
"1.17.6-2",
"1.18.1-1",
"1.18.4-1",
"1.18.4-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49283.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "simplesamlphp",
"binary_version": "1.18.4-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "simplesamlphp",
"purl": "pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps%2Fjammy",
"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
"1.19.1-1",
"1.19.1-1.1",
"1.19.1-1.1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49283.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "simplesamlphp",
"binary_version": "1.19.1-1.1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "simplesamlphp",
"purl": "pkg:deb/ubuntu/simplesamlphp?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"1.19.7-1",
"1.19.7-1+deb12u1ubuntu0.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49283.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "simplesamlphp",
"binary_version": "1.19.7-1+deb12u1ubuntu0.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "simplesamlphp",
"purl": "pkg:deb/ubuntu/simplesamlphp?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"1.19.7-2",
"2.1.8-0.1",
"2.2.6-1",
"2.3.11-1",
"2.3.11-2",
"2.4.8-1",
"2.5.3.1-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49283.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "simplesamlphp",
"binary_version": "2.5.3.1-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "simplesamlphp",
"purl": "pkg:deb/ubuntu/simplesamlphp?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1.19.7-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49283.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "simplesamlphp",
"binary_version": "1.19.7-2"
}
]
}
}
],
"modified": "2026-10-17T12:58:32.116889616Z",
"provider": "osv",
"upstream": [
"CVE-2026-49283"
],
"references": [
"https://ubuntu.com/security/CVE-2026-49283",
"https://www.cve.org/CVERecord?id=CVE-2026-49283"
]
},
"related_cves": [
{
"value": "CVE-2026-49283",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 358711,
"published_at": "2026-08-19T15:17:00+00:00"
}