CVE-2026-57175: Social auth core Social-auth-core Has An Improper Authentication Vulnerability
MODERATECVE-2026-57175 is a MODERATE (CVSS 6.4) social-auth-core has an improper authentication vulnerability (CWE-287: Improper Authentication) affecting Social auth core libraries in the PyPI ecosystem. The issue involves social-auth-core has an improper authentication issue. Remediation is available by upgrading affected packages to version 5.0.0.
CVE-2026-57175 at a Glance
Security Impact
CVSS: 6.4
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N).
How to Fix CVE-2026-57175
To remediate this vulnerability, upgrade all affected Social auth core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
pip install social-auth-core>=5.0.0Run the following command in your project directory to verify that all resolved dependencies use the patched release:
pip show social-auth-coreHow to Check if You Are Affected
To determine whether your Python environment is affected by CVE-2026-57175, inspect your installed packages using pip:
pip show social-auth-coreAnalyze the terminal output to locate any version of Social auth core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.0.0), your application is affected.
Note: The pip show social-auth-core command checks currently installed packages in your active Python environment.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-287: Improper Authentication, where when an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. In Social auth core, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-57175 Affected Social auth core Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
social-auth-core
|
PyPI |
< 5.0.0
|
5.0.0
|
References
Frequently Asked Questions
What is CVE-2026-57175?
Which Social auth core versions are affected?
What version fixes CVE-2026-57175?
Is social-auth-core affected?
What is the CVSS score of CVE-2026-57175?
What CWE is associated with CVE-2026-57175?
How can I check PyPI dependencies for CVE-2026-57175?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-vq6g-g6c7-5f2j",
"modified" : "2026-09-24T19:54:48Z",
"published" : "2026-09-24T19:54:48Z",
"aliases" : [ "CVE-2026-57175" ],
"summary" : "social-auth-core has an Improper Authentication issue",
"details" : "### Impact\n\nThe SAML backend accepted SAML responses on the Assertion Consumer Service endpoint without verifying that they matched a previously issued `AuthnRequest`.\n\nApplications using SAML account association could allow an attacker with a valid account on a trusted IdP to link the attacker's SAML identity to a logged-in victim's local account. The attacker could then authenticate through SAML and gain access to the victim's account.\n\nThe issue affects applications using the SAML backend together with authenticated account association.\n\n### Patches\n\nThe issue has been fixed by validating SAML responses against stored `AuthnRequest` IDs.\n\nUsers should upgrade to a patched version.\n\nFix:\n\n* https://github.com/python-social-auth/social-core/pull/1794\n\n### Workarounds\n\nApplications that cannot upgrade immediately should disable SAML account association for already authenticated users.\n\nIf SAML login is not required, the SAML backend can also be disabled by removing it from `SOCIAL_AUTH_AUTHENTICATION_BACKENDS`.\n\nThere is no complete workaround while continuing to allow vulnerable SAML account association.\n\n### Credits\n\nReported through GitHub private vulnerability reporting by Liyi Zhou, Ziyue Wang, Strick, Maurice, and Chenchen Yu from the University of Sydney security research team.\n\nReporter references:\n\n* https://lzhou1110.github.io/\n* https://zyy0530.github.io/\n* https://str1ckl4nd.github.io/\n* https://maurice.busystar.org/\n* https://7thparkk.github.io/",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "PyPI",
"name" : "social-auth-core"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "5.0.0"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/python-social-auth/social-core/security/advisories/GHSA-vq6g-g6c7-5f2j"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-57175"
}, {
"type" : "WEB",
"url" : "https://github.com/python-social-auth/social-core/pull/1794"
}, {
"type" : "WEB",
"url" : "https://github.com/python-social-auth/social-core/commit/5c72f71125bc60e4411f09e2a9f998de5da7fcb6"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/python-social-auth/social-core"
}, {
"type" : "WEB",
"url" : "https://github.com/python-social-auth/social-core/releases/tag/5.0.0"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-287" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-09-24T19:54:48Z",
"nvd_published_at" : "2026-09-24T18:17:14Z"
}
}