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EUVD-2026-375388

fkie_cve-2026-57179

Python Social Auth is a social authentication/registration mechanism. Prior to version 5.0.0, the partial-pipeline resume mechanism accepted `partial_token` as a bearer credential without binding it to the browser session that created it. Applications 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. The issue affects applications using partial pipeline steps such as `mail_validation` or custom steps decorated with `@partial`. The issue has been fixed in version 5.0.0 by binding partial pipeline resumes to the originating browser session.

GHSA-vqg6-3fw6-j9jg — social-auth-core has a Session Fixation issue

Affected: PyPI: social-auth-core

### Impact

The partial-pipeline resume mechanism accepted `partial_token` as a bearer credential without binding it to the browser session that created it.

Applications 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.

The issue affects applications using partial pipeline steps such as `mail_validation` or custom steps decorated with `@partial`.

### Patches

The issue has been fixed by binding partial pipeline resumes to the originating browser session.

Users should upgrade to a patched version.

Fix:

* https://github.com/python-social-auth/social-core/pull/1816 * https://github.com/python-social-auth/social-docs/pull/444 * https://github.com/python-social-auth/social-app-django/pull/1009

### Workarounds

Applications that cannot upgrade immediately should disable resumable partial pipeline steps, including `mail_validation` and custom steps decorated with `@partial`.

If those flows are required, applications should avoid accepting partial resume links from untrusted contexts until a patched version can be deployed.

There is no complete workaround while continuing to use the vulnerable partial-pipeline resume mechanism.

### Credits

Reported through GitHub private vulnerability reporting by Liyi Zhou, Ziyue Wang, Strick, Maurice,…

PYSEC-2026-4168 — social-auth-core has a Session Fixation issue