---
title: "CVE-2026-57178: Python Social Auth - Authentication Bypass"
description: "Python Social Auth < 5.0.0 contains an authentication bypass caused by missing verification of VK callback signature in vk-app backend, letting attackers authenticate as arbitrary VK users, exploit requires omission of auth_key parameter."
url: https://panop.io/threat-heartbeat/CVE-2026-57178/
---

# CVE-2026-57178 Python Social Auth - Authentication Bypass

Python Social Auth < 5.0.0 contains an authentication bypass caused by missing verification of VK callback signature in vk-app backend, letting attackers authenticate as arbitrary VK users, exploit requires omission of auth\_key parameter.

CVSS base score 7.4 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.16% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-57178)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

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

Published

24 September 2026

Updated

15 October 2026

Weakness

[CWE-287](https://cwe.mitre.org/data/definitions/287.html)

## Vendor fix

Upgrade to version 5.0.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-57178](https://nvd.nist.gov/vuln/detail/CVE-2026-57178)
- [https://github.com/python-social-auth/social-core/security/advisories/GHSA-3c93-f73f-qc9h](https://github.com/python-social-auth/social-core/security/advisories/GHSA-3c93-f73f-qc9h)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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