Improper Verification of Cryptographic Signature Affecting social-auth-core package, versions [,5.0.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-SOCIALAUTHCORE-20158373
- published27 Sept 2026
- disclosed24 Sept 2026
- creditUnknown
Introduced: 24 Sep 2026
NewCVE-2026-57178 (opens in a new tab)How to fix?
Upgrade social-auth-core to version 5.0.0 or higher.
Overview
social-auth-core is a package that makes Python social authentication simple.
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the auth_complete method in the VKAppOAuth2 backend, where the auth_key signature is not required to be present in the callback payload. An attacker can submit a callback request without an auth_key value, bypassing signature verification entirely and authenticating as an arbitrary VK user.