UBUNTU-CVE-2026-115910 (CVE-2026-115910)
Vulnerability from osv_ubuntu – Published: 2026-10-26 17:17 – Updated: 2026-10-28 17:50 – Source website
VLAI
Details
Python Social Auth is a social authentication and registration mechanism. Prior to 6.2.0, OpenIdConnectAuth in social_core/backends/open_id_connect.py uses get_and_store_nonce to place the OpenID Connect nonce in a shared OpenIdConnectAssociation table, and get_nonce and validate_claims verify only that the nonce exists and has not expired rather than binding it to the browser session and OAuth state that initiated the login. An attacker who obtains a victim's unused authorization code can start a separate login to obtain valid state for the attacker's browser, submit the victim's code with that state, and pass nonce validation because the victim nonce is globally available. With DEFAULT_USE_PKCE disabled in the default OpenIdConnectAuth configuration, the attacker can be logged in as the victim. This issue is fixed in version 6.2.0.
Severity
6.8 (Medium)
6.8 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-social-auth-core",
"binary_version": "3.1.0-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "social-auth-core",
"purl": "pkg:deb/ubuntu/social-auth-core@3.1.0-1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.1.0-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-social-auth-core",
"binary_version": "4.2.0-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "social-auth-core",
"purl": "pkg:deb/ubuntu/social-auth-core@4.2.0-1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.1.0-1.1",
"4.1.0-1",
"4.2.0-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-social-auth-core",
"binary_version": "4.5.3-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "social-auth-core",
"purl": "pkg:deb/ubuntu/social-auth-core@4.5.3-1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.4.2-2",
"4.5.3-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-social-auth-core",
"binary_version": "5.0.2-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.10",
"name": "social-auth-core",
"purl": "pkg:deb/ubuntu/social-auth-core@5.0.2-1?arch=source\u0026distro=stonking"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.8.3-1",
"5.0.2-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-social-auth-core",
"binary_version": "4.8.3-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "social-auth-core",
"purl": "pkg:deb/ubuntu/social-auth-core@4.8.3-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.6.1-1",
"4.8.1-1",
"4.8.3-1"
]
}
],
"aliases": [],
"details": "Python Social Auth is a social authentication and registration mechanism. Prior to 6.2.0, OpenIdConnectAuth in social_core/backends/open_id_connect.py uses get_and_store_nonce to place the OpenID Connect nonce in a shared OpenIdConnectAssociation table, and get_nonce and validate_claims verify only that the nonce exists and has not expired rather than binding it to the browser session and OAuth state that initiated the login. An attacker who obtains a victim\u0027s unused authorization code can start a separate login to obtain valid state for the attacker\u0027s browser, submit the victim\u0027s code with that state, and pass nonce validation because the victim nonce is globally available. With DEFAULT_USE_PKCE disabled in the default OpenIdConnectAuth configuration, the attacker can be logged in as the victim. This issue is fixed in version 6.2.0.",
"id": "UBUNTU-CVE-2026-115910",
"modified": "2026-10-28T17:50:38Z",
"published": "2026-10-26T17:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-115910"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-115910"
},
{
"type": "REPORT",
"url": "https://github.com/python-social-auth/social-core/commit/c2f2ae4663bef19ee8b07f2cf5a2344f9155d826"
},
{
"type": "REPORT",
"url": "https://github.com/python-social-auth/social-core/pull/2141"
},
{
"type": "REPORT",
"url": "https://github.com/python-social-auth/social-core/security/advisories/ghsa-h2r5-x5m7-3935"
},
{
"type": "REPORT",
"url": "https://security-tracker.debian.org/tracker/cve-2026-115910"
},
{
"type": "REPORT",
"url": "https://github.com/cveproject/cvelistv5/tree/main/cves/2026/115xxx/cve-2026-115910.json"
},
{
"type": "REPORT",
"url": "https://github.com/python-social-auth/social-core/releases/tag/6.2.0"
},
{
"type": "REPORT",
"url": "https://nvd.nist.gov/vuln/detail/cve-2026-115910"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-115910"
]
}
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