CVE-2026-57179: Social auth core Social-auth-core Has A Session Fixation Vulnerability
MODERATECVE-2026-57179 is a MODERATE (CVSS 4.2) social-auth-core has a session fixation vulnerability (CWE-384: Session Fixation) affecting Social auth core libraries in the PyPI ecosystem. The issue involves social-auth-core has a session fixation issue. Remediation is available by upgrading affected packages to version 5.0.0.
CVE-2026-57179 at a Glance
Security Impact
CVSS: 4.2
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N).
How to Fix CVE-2026-57179
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-2026-57179, 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-384: Session Fixation, where authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions. 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-2026-57179 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-2026-57179?
Which Social auth core versions are affected?
What version fixes CVE-2026-57179?
Is social-auth-core affected?
What is the CVSS score of CVE-2026-57179?
What CWE is associated with CVE-2026-57179?
How can I check PyPI dependencies for CVE-2026-57179?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-vqg6-3fw6-j9jg",
"modified" : "2026-09-24T19:58:14Z",
"published" : "2026-09-24T19:58:14Z",
"aliases" : [ "CVE-2026-57179" ],
"summary" : "social-auth-core has a Session Fixation issue",
"details" : "### Impact\n\nThe partial-pipeline resume mechanism accepted `partial_token` as a bearer credential without binding it to the browser session that created it.\n\nApplications using resumable partial pipeline steps could allow an attacker to start an authentication flow, obtain a valid partial token and verification data, and cause a victim's browser to resume that attacker-controlled flow. This could authenticate the victim's browser as the attacker's account.\n\nThe issue affects applications using partial pipeline steps such as `mail_validation` or custom steps decorated with `@partial`.\n\n### Patches\n\nThe issue has been fixed by binding partial pipeline resumes to the originating browser session.\n\nUsers should upgrade to a patched version.\n\nFix:\n\n* https://github.com/python-social-auth/social-core/pull/1816\n* https://github.com/python-social-auth/social-docs/pull/444\n* https://github.com/python-social-auth/social-app-django/pull/1009\n\n### Workarounds\n\nApplications that cannot upgrade immediately should disable resumable partial pipeline steps, including `mail_validation` and custom steps decorated with `@partial`.\n\nIf those flows are required, applications should avoid accepting partial resume links from untrusted contexts until a patched version can be deployed.\n\nThere is no complete workaround while continuing to use the vulnerable partial-pipeline resume mechanism.\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:N/UI:R/S:U/C:L/I:L/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-vqg6-3fw6-j9jg"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-57179"
}, {
"type" : "WEB",
"url" : "https://github.com/python-social-auth/social-core/pull/1816"
}, {
"type" : "WEB",
"url" : "https://github.com/python-social-auth/social-core/commit/0418782454ac7bbc6a9230ea21f7f5066fe89686"
}, {
"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-384" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-09-24T19:58:14Z",
"nvd_published_at" : "2026-09-24T18:17:15Z"
}
}