social-auth-core has a Session Fixation issue

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.2 · CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS

• CVE-2026-57179: 0.16% estimated exploitation activity in the next 30 days; percentile 4.96 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact The partial-pipeline resume mechanism accepted partialtoken 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 mailvalidation 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…

Published by the source

24 Sep 2026, 19:58 UTC

Last modified by the source

1 Oct 2026, 17:56 UTC

Source last checked

26 Oct 2026, 13:54 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-vqg6-3fw6-j9jg

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-vqg6-3fw6-j9jg

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-vqg6-3fw6-j9jg

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# Patch Next advisory brief: CVE-2026-57179

Advisory: social-auth-core has a Session Fixation issue
IDs: CVE-2026-57179, GHSA-vqg6-3fw6-j9jg
Record: https://patchnext.com/advisories/cve-2026-57179 (revision 3, source checked 26 Oct 2026, 13:54 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: social-auth-core 5.0.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI social-auth-core: affected < 5.0.0; fixed in 5.0.0

## Suggested inspection (read-only)
- `python -m pip show social-auth-core`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on social-auth-core.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-vqg6-3fw6-j9jg (GitHub-reviewed advisory GHSA-vqg6-3fw6-j9jg lists affected ranges: PyPI social-auth-core >=0 <5.0.0)
- Verified: https://osv.dev/vulnerability/GHSA-vqg6-3fw6-j9jg (OSV record GHSA-vqg6-3fw6-j9jg lists affected ranges: PyPI social-auth-core >=0 <5.0.0 (fixed))

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