CVE-2026-57178

Python Social Auth is a social authentication/registration mechanism. Prior to version 5.0.0, the `vk-app` backend accepted VK application callback data without verifying the callback signature when the `auth_key` parameter was omitted. Applications using this backend could treat unsigned attacker-controlled data as a verified VK identity. An attacker could choose callback fields such as `viewer_id`, `access_token`, `api_id`, and `api_result`, potentially allowing authentication as an arbitrary VK user ID. The issue affects only applications using the `vk-app` backend. The issue has been fixed in version 5.0.0 by requiring `auth_key` to be present and valid before callback data is trusted.

• CWE-287
• CWE-347

• https://github.com/python-social-auth/social-core/security/advisories/GHSA-3c93-f73f-qc9h

Published

Sep 24, 2026

Last Modified

Sep 25, 2026

Status

Awaiting Analysis

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