{"uuid": "787a340d-77ef-4d15-bbbf-2beed2b7b740", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "GHSA-3c93-f73f-qc9h", "type": "seen", "source": "https://gist.github.com/alon710/16f5dd43c99d69c085ca2b85bb1225f7", "content": "# CVE-2026-57178: CVE-2026-57178: Authentication Bypass via Missing Signature Verification in social-auth-core\n\n> **CVSS Score:** 7.4\n> **Published:** 2026-09-24\n> **Full Report:** https://cvereports.com/reports/CVE-2026-57178\n\n## Summary\nAn authentication bypass vulnerability exists in the VKontakte App backend of social-auth-core prior to version 5.0.0. The vulnerability allows remote attackers to bypass cryptographic signature verification and gain unauthorized access to arbitrary accounts by omitting the signature parameter.\n\n## TL;DR\nApplications using the vk-app authentication backend in social-auth-core < 5.0.0 fail to verify signatures if the auth_key parameter is completely omitted, allowing full account bypass via spoofed VKontakte user IDs.\n\n## Exploit Status: POC\n\n## Technical Details\n\n- **CWE ID**: CWE-287 / CWE-347\n- **Attack Vector**: Network\n- **CVSS Severity**: 7.4 (High)\n- **Impact**: Unauthenticated Account Takeover\n- **Exploit Status**: PoC / Conceptual\n- **KEV Status**: Not listed\n\n## Affected Systems\n\n- Python Social Auth libraries running social-auth-core < 5.0.0\n- Django applications using social-auth-app-django with VKAppOAuth2 backend enabled\n- Flask and Webpy integrations configured to use VKAppOAuth2\n- **social-auth-core**: < 5.0.0 (Fixed in: `5.0.0`)\n\n## Mitigation\n\n- Upgrade the social-auth-core library to version 5.0.0 or later.\n- Disable the vulnerable VKAppOAuth2 backend from configuration settings if upgrades are blocked.\n- Fallback to the standard VKOAuth2 backend for VKontakte integrations.\n\n**Remediation Steps:**\n1. Open your dependency specification files (e.g., requirements.txt, Pipfile, poetry.lock).\n2. Modify the social-auth-core entry to point to version >= 5.0.0.\n3. Execute your package manager upgrade command (e.g., pip install --upgrade social-auth-core>=5.0.0).\n4. Inspect configuration settings for references to social_core.backends.vk.VKAppOAuth2 and verify its removal if on an older version.\n\n## References\n\n- [CVE Official Record](https://www.cve.org/CVERecord?id=CVE-2026-57178)\n- [NVD Page](https://nvd.nist.gov/vuln/detail/CVE-2026-57178)\n- [GitHub Security Advisory GHSA-3c93-f73f-qc9h](https://github.com/python-social-auth/social-core/security/advisories/GHSA-3c93-f73f-qc9h)\n- [Remediation Pull Request](https://github.com/python-social-auth/social-core/pull/1811)\n- [Vulnerability Fix Commit](https://github.com/python-social-auth/social-core/commit/1bfacdd0379e5eb46e169a99ab648b835e9bb6a2)\n- [Version 5.0.0 Release Notes](https://github.com/python-social-auth/social-core/releases/tag/5.0.0)\n\n\n---\n*Generated by [CVEReports](https://cvereports.com/reports/CVE-2026-57178) - Automated Vulnerability Intelligence*", "creation_timestamp": "2026-09-24T22:30:32.000000Z"}