social-auth-core: VK App backend accepts unsigned callback data when auth_key is missing

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0016, the 5th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 14:09 UTC First seen by agentprime
2. 31 Oct 2026, 14:09 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-3c93-f73f-qc9h
• OSV: GHSA-3c93-f73f-qc9h
• github.com/python-social-auth/social-core/security/advisories/GHSA-3c93-f73f-qc9h
• nvd.nist.gov/vuln/detail/CVE-2026-57178
• github.com/python-social-auth/social-core/pull/1811
• github.com/python-social-auth/social-core/commit/1bfacdd0379e5eb46e169a99ab648b835e9bb6a2
• github.com/python-social-auth/social-core
• github.com/python-social-auth/social-core/releases/tag/5.0.0

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.