social-auth-core has an Improper Authentication issue

Exploitation

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

CVSS

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

EPSS

• CVE-2026-57175: 0.23% estimated exploitation activity in the next 30 days; percentile 13.61 (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 SAML backend accepted SAML responses on the Assertion Consumer Service endpoint without verifying that they matched a previously issued AuthnRequest. Applications using SAML account association could allow an attacker with a valid account on a trusted IdP to link the attacker's SAML identity to a logged-in victim's local account. The attacker could then authenticate through SAML and gain access to the victim's account. The issue affects applications using the SAML backend together with authenticated account association. Patches The issue has been fixed by validating SAML responses against stored AuthnRequest IDs. Users should upgrade to a patched version. Fix: https://github.com/python-social-auth/social-core/pull/1794 Workarounds Applications that cannot upgrade immediately should disable SAML account association for already authenticated users. If SAML login is not required, the SAML backend can also be disabled by removing it from SOCIALAUTHAUTHENTICATIONBACKENDS. There…

Published by the source

24 Sep 2026, 19:54 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-vq6g-g6c7-5f2j

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-vq6g-g6c7-5f2j

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-vq6g-g6c7-5f2j

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# Patch Next advisory brief: CVE-2026-57175

Advisory: social-auth-core has an Improper Authentication issue
IDs: CVE-2026-57175, GHSA-vq6g-g6c7-5f2j
Record: https://patchnext.com/advisories/cve-2026-57175 (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 6.4)
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-vq6g-g6c7-5f2j (GitHub-reviewed advisory GHSA-vq6g-g6c7-5f2j lists affected ranges: PyPI social-auth-core >=0 <5.0.0)
- Verified: https://osv.dev/vulnerability/GHSA-vq6g-g6c7-5f2j (OSV record GHSA-vq6g-g6c7-5f2j lists affected ranges: PyPI social-auth-core >=0 <5.0.0 (fixed))

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