Improper Authentication Affecting social-auth-core package, versions <5.0.2-1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.16% (5th percentile)

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  • Snyk IDSNYK-DEBIAN14-SOCIALAUTHCORE-20153967
  • published26 Sept 2026
  • disclosed24 Sept 2026

Introduced: 24 Sep 2026

CVE-2026-57178  (opens in a new tab)
CWE-287  (opens in a new tab)
CWE-347  (opens in a new tab)

How to fix?

Upgrade Debian:14 social-auth-core to version 5.0.2-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream social-auth-core package and not the social-auth-core package as distributed by Debian. See How to fix? for Debian:14 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1