social-auth-core Vulnerable to Account Takeover via Identity Binding Flaw in Vend Backend

Exploitation

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

CVSS

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

EPSS

• CVE-2026-57176: 0.22% estimated exploitation activity in the next 30 days; percentile 12.45 (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 Vend OAuth2 backend used only the numeric Vend userid as the social-auth UID. When multiple Vend shops authenticate through the same application, users from different shops with the same internal Vend user ID could collide in the social-auth association table. A user from one shop could then be authenticated as the local account previously associated with the same numeric user ID from another shop. The issue affects applications using the Vend OAuth2 backend with more than one Vend shop. Patches The issue has been fixed by scoping Vend social-auth UIDs by shop. Users should upgrade to a patched version. Fix: https://github.com/python-social-auth/social-core/pull/1795 Workarounds Applications that cannot upgrade immediately should restrict the Vend OAuth2 backend to a single trusted Vend shop. If Vend authentication is not required, the Vend backend can also be disabled by removing it from SOCIALAUTHAUTHENTICATIONBACKENDS. There is no complete workaround while continuing to…

Published by the source

24 Sep 2026, 19:55 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-fp7w-m676-w7gc

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-fp7w-m676-w7gc

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-fp7w-m676-w7gc

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# Patch Next advisory brief: CVE-2026-57176

Advisory: social-auth-core Vulnerable to Account Takeover via Identity Binding Flaw in Vend Backend
IDs: CVE-2026-57176, GHSA-fp7w-m676-w7gc
Record: https://patchnext.com/advisories/cve-2026-57176 (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 6.8)
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-fp7w-m676-w7gc (GitHub-reviewed advisory GHSA-fp7w-m676-w7gc lists affected ranges: PyPI social-auth-core >=0 <5.0.0)
- Verified: https://osv.dev/vulnerability/GHSA-fp7w-m676-w7gc (OSV record GHSA-fp7w-m676-w7gc lists affected ranges: PyPI social-auth-core >=0 <5.0.0 (fixed))

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