CVE-2026-57179: python-social-auth social-auth-core session fixation in partial pipeline resume

CVE-2026-57179 · Severity: medium · CVSS 4.2 · Published 2026-09-24

python-social-auth is a popular library used by web applications to handle user authentication via external social media and identity providers. A flaw in the partial pipeline resume mechanism allows an attacker to hijack a victim's browser session by tricking it into resuming an attacker-controlled authentication flow, potentially logging the victim in as the attacker's account.

Technologies: social-auth-core (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2026-57179 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-57179 being exploited in the wild.
How severe is CVE-2026-57179?
Medium severity, with a CVSS score of 4.2, published 24 September 2026.
Which products and versions are affected?
social-auth-core (PyPI) < 5.0.0, ECOSYSTEM:introduced=0,fixed=5.0.0.
Is there a fix for CVE-2026-57179?
Yes. social-auth-core (PyPI): upgrade to 5.0.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-57179 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-57179?
Check whether you run social-auth-core (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • social-auth-core (PyPI): upgrade to 5.0.0 or later
    pip install "social-auth-core>=5.0.0"

Technical details

The vulnerability is a session fixation issue in the partial-pipeline resume mechanism of social-auth-core. The root cause is that the library accepted partial_token as a bearer credential without binding it to the browser session that originally created it. An attacker can start an authentication flow, obtain a valid partial token and verification data (e.g., from mail_validation or custom @partial-decorated steps), and then cause a victim's browser to resume that attacker-controlled flow. The attack requires the victim to click a malicious link or be socially engineered into resuming the flow. The issue has been patched by binding partial pipeline resumes to the originating browser session. Patches are available in social-core, social-app-django, and related repositories.

Affected products

  • python-social-auth social-auth-core <unknown>

Identifiers

  • CVE-2026-57179
  • GHSA-vqg6-3fw6-j9jg
  • PYSEC-2026-4168

Timeline

  • 2026-09-24: disclosed
  • 2026-09-24: patched: Patches available in social-core PR #1816, social-app-django PR #1009, and social-docs PR #444

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