High
simplesamlphp — security advisory
SimpleSAMLphp versions before 1.18.6 contain an information disclosure vulnerability. Prior to 2.4.7 and 2.5.2, SimpleSAMLphp's SAML SP ACS path does not enforce the IdP selected for an SP-initiated login when unsigned Response/InResponseTo is combined with a signed assertion lacking SubjectConfirmationData/InResponseTo, allowing a response issued by one trusted IdP to be bound to SP state created for another IdP and bypass flows that route users to a specific IdP, including deployments that set enable_unsolicited to false. This issue is fixed in versions 2.4.7 and 2.5.2.
- 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-2026-49284
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:26 UTC · Revision 1
Source evidence
SimpleSAMLphp versions before 1.18.6 contain an information disclosure vulnerability. Prior to 2.4.7 and 2.5.2, SimpleSAMLphp's SAML SP ACS path does not enforce the IdP selected for an SP-initiated login when unsigned Response/InResponseTo is combined with a signed assertion lacking SubjectConfirmationData/InResponseTo, allowing a response issued by one trusted IdP to be bound to SP state created for another IdP and bypass flows that route users to a specific IdP, including deployments that set enable_unsolicited to false. This issue is fixed in versions 2.4.7 and 2.5.2.
osv:UBUNTU-CVE-2026-49284
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": "d17309b1159a5aefd5946339ac3e7c22352256892dccddd5458c641d3f178618",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-49284",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-49284",
"summary": "SimpleSAMLphp versions before 1.18.6 contain an information disclosure vulnerability. Prior to 2.4.7 and 2.5.2, SimpleSAMLphp's SAML SP ACS path does not enforce the IdP selected for an SP-initiated login when unsigned Response/InResponseTo is combined with a signed assertion lacking SubjectConfirmationData/InResponseTo, allowing a response issued by one trusted IdP to be bound to SP state created for another IdP and bypass flows that route users to a specific IdP, including deployments that set enable_unsolicited to false. This issue is fixed in versions 2.4.7 and 2.5.2.",
"evidence": "osv:UBUNTU-CVE-2026-49284",
"products": [
{
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"evidence": "/affected/0/package/name"
},
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
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{
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"evidence": "/affected/1/package/name"
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"evidence": "/affected/1/versions"
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{
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{
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"evidence": "/affected/1/versions"
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{
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},
{
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"evidence": "/affected/1/versions"
},
{
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"evidence": "/affected/1/versions"
}
]
},
{
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},
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
},
{
"value": "1.18.4-1",
"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
}
]
},
{
"name": {
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"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
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"evidence": "/affected/3/versions"
},
{
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"evidence": "/affected/3/versions"
},
{
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"evidence": "/affected/3/versions"
}
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{
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},
"prerequisites": [],
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"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": {
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"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
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"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-49284",
"aliases": [
"UBUNTU-CVE-2026-49284"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
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"purl": "pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps-legacy%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
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"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-2026-49284.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": [
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"1.15.0-1",
"1.15.1-1",
"1.15.2-1",
"1.15.3-1",
"1.15.3-1ubuntu0.1~esm1"
],
"database_specific": {
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"ecosystem_specific": {
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{
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"package": {
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"purl": "pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps%2Ffocal",
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},
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},
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],
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],
"modified": "2026-10-17T12:58:32.511770108Z",
"provider": "osv",
"upstream": [
"CVE-2026-49284"
],
"references": [
"https://ubuntu.com/security/CVE-2026-49284",
"https://www.cve.org/CVERecord?id=CVE-2026-49284",
"https://github.com/simplesamlphp/simplesamlphp/security/advisories/GHSA-q8r6-xj3f-wrrm"
]
},
"related_cves": [
{
"value": "CVE-2026-49284",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 358723,
"published_at": "2026-07-17T20:17:00+00:00"
}