Vulnerability · Published Sep 24, 2026 · Assigned by GitHub_M
CVE-2026-57176social-auth-core Vulnerable to Account Takeover via Identity Binding Flaw in Vend Backend
Medium 6.8
In plain English
A medium-severity security flaw in social-core from python-social-auth. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Python Social Auth is a social authentication/registration mechanism. Prior to version 5.0.0, the Vend OAuth2 backend used only the numeric Vend user_id as the social-auth UID. When multiple Vend shops authenticate through the same application, users from different shops with the same internal Vend user ID could collide in the social-auth association table. A user from one shop could then be authenticated as the local account previously associated with the same numeric user ID from another shop. The issue affects applications using the Vend OAuth2 backend with more than one Vend shop. Version 5.0.0 patches the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | social-auth-core | no fix listed | DEBIAN-CVE-2026-57176 |
| Debian:13 | social-auth-core | no fix listed | DEBIAN-CVE-2026-57176 |
| Debian:14 | social-auth-core | 5.0.2-1 | DEBIAN-CVE-2026-57176 |
| PyPI | social-auth-core | 5.0.0 | GHSA-fp7w-m676-w7gc |
| PyPI | social-auth-core | 5.0.0 | PYSEC-2026-4166 |
| Ubuntu:22.04:LTS | python3.10 | no fix listed | UBUNTU-CVE-2026-57176 |
| Ubuntu:24.04:LTS | python3.12 | no fix listed | UBUNTU-CVE-2026-57176 |
| Ubuntu:26.04:LTS | python3.14 | no fix listed | UBUNTU-CVE-2026-57176 |
| Ubuntu:26.10 | python3.14 | no fix listed | UBUNTU-CVE-2026-57176 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| python-social-auth | social-core | < 5.0.0 |
Weakness: CWE-289 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N