CriticalFix available
Session Fixation in ipsilon
Type: advisorySources: OSV
A vulnerability in ipsilon 2.0 before 2.0.2, 1.2 before 1.2.1, 1.1 before 1.1.2, and 1.0 before 1.0.3 was found that allows attacker to log out active sessions of other users. This issue is related to how it tracks sessions, and allows an unauthenticated attacker to view and terminate active sessions from other users. It is also called a "SAML2 multi-session vulnerability."
- Products
- ipsilon
- Affected versions
- 1.2.0
- Fixed versions
- 1.0.3, 1.1.2, 1.2.1, 2.0.2
- CVEs
- CVE-2016-8638
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 18:51 UTC · Revision 1
Source evidence
A vulnerability in ipsilon 2.0 before 2.0.2, 1.2 before 1.2.1, 1.1 before 1.1.2, and 1.0 before 1.0.3 was found that allows attacker to log out active sessions of other users. This issue is related to how it tracks sessions, and allows an unauthenticated attacker to view and terminate active sessions from other users. It is also called a "SAML2 multi-session vulnerability."
osv:GHSA-376m-3rm2-9jm6
ipsilon
Fixed versions: 2.0.2
ipsilon
Fixed versions: 1.2.1
ipsilon
Fixed versions: 1.1.2
ipsilon
Fixed versions: 1.0.3
Complete source record
{
"id": "aca32e015d8512b36ffb93c17ac28431fdd3f96b0d258c6e854c55094171de70",
"url": "https://osv.dev/vulnerability/GHSA-376m-3rm2-9jm6",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Session Fixation in ipsilon",
"summary": "A vulnerability in ipsilon 2.0 before 2.0.2, 1.2 before 1.2.1, 1.1 before 1.1.2, and 1.0 before 1.0.3 was found that allows attacker to log out active sessions of other users. This issue is related to how it tracks sessions, and allows an unauthenticated attacker to view and terminate active sessions from other users. It is also called a \"SAML2 multi-session vulnerability.\"",
"evidence": "osv:GHSA-376m-3rm2-9jm6",
"products": [
{
"name": {
"value": "ipsilon",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.0.2",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "ipsilon",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.2.1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "1.2.0",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "ipsilon",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.1.2",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "ipsilon",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.0.3",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
}
],
"severity": "critical",
"structured": {
"id": "GHSA-376m-3rm2-9jm6",
"aliases": [
"CVE-2016-8638",
"GHSA-376m-3rm2-9jm6",
"PYSEC-2026-360"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.0.0"
},
{
"fixed": "2.0.2"
}
]
}
],
"package": {
"name": "ipsilon",
"purl": "pkg:pypi/ipsilon",
"ecosystem": "PyPI"
},
"database_specific": {
"source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-376m-3rm2-9jm6/GHSA-376m-3rm2-9jm6.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "1.2.0"
},
{
"fixed": "1.2.1"
}
]
}
],
"package": {
"name": "ipsilon",
"purl": "pkg:pypi/ipsilon",
"ecosystem": "PyPI"
},
"versions": [
"1.2.0"
],
"database_specific": {
"source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-376m-3rm2-9jm6/GHSA-376m-3rm2-9jm6.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "1.1.0"
},
{
"fixed": "1.1.2"
}
]
}
],
"package": {
"name": "ipsilon",
"purl": "pkg:pypi/ipsilon",
"ecosystem": "PyPI"
},
"database_specific": {
"source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-376m-3rm2-9jm6/GHSA-376m-3rm2-9jm6.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "1.0.0"
},
{
"fixed": "1.0.3"
}
]
}
],
"package": {
"name": "ipsilon",
"purl": "pkg:pypi/ipsilon",
"ecosystem": "PyPI"
},
"database_specific": {
"source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-376m-3rm2-9jm6/GHSA-376m-3rm2-9jm6.json"
}
}
],
"modified": "2026-10-27T17:45:04.012363817Z",
"provider": "osv",
"references": [
"https://nvd.nist.gov/vuln/detail/CVE-2016-8638",
"https://github.com/ipsilon-project/ipsilon/commit/1c48414877fc110652b6078a29529972c7ec9122",
"https://github.com/ipsilon-project/ipsilon/commit/64fc366c054fc6af1d9d2692902db169884b5f78",
"https://github.com/ipsilon-project/ipsilon/commit/a33303b6beb5c316d7c18b23566b7666a4e307a4",
"https://github.com/ipsilon-project/ipsilon/commit/b4744a92d4fa7f6d7ade0ae2d99a2dc0ea94734d",
"https://access.redhat.com/errata/RHSA-2016:2809",
"https://access.redhat.com/security/cve/CVE-2016-8638",
"https://bugzilla.redhat.com/show_bug.cgi?id=1392829",
"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8638",
"https://github.com/advisories/GHSA-376m-3rm2-9jm6",
"https://github.com/ipsilon-project/ipsilon",
"https://github.com/pypa/advisory-database/tree/main/vulns/ipsilon/PYSEC-2026-360.yaml",
"https://ipsilon-project.org/advisory/CVE-2016-8638.txt",
"https://ipsilon-project.org/release/2.1.0.html",
"https://pagure.io/ipsilon/c/511fa8b7001c2f9a42301aa1d4b85aaf170a461c",
"https://pypi.org/project/ipsilon"
],
"provider_metadata": {
"cwe_ids": [
"CWE-384"
],
"severity": "CRITICAL",
"github_reviewed": true,
"nvd_published_at": "2017-07-12T13:29:00Z",
"github_reviewed_at": "2023-02-14T00:46:20Z"
}
},
"related_cves": [
{
"value": "CVE-2016-8638",
"evidence": "/aliases"
}
],
"security_relevant": true,
"severity_evidence": "/database_specific/severity"
},
"source_id": "core-osv",
"document_id": 463047,
"published_at": "2022-05-14T03:55:23+00:00"
}