CVE-2026-57176 social-auth-core Vulnerable to Account Takeover via Identity Binding Flaw in Vend Backend
Attackers can hijack accounts by exploiting user ID collisions across multiple Vend shops in the social-auth-core library.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-57176?
CVE-2026-57176 is a medium-severity authentication bypass vulnerability in python-social-auth social-core, published on 24 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-289
Which versions are affected by CVE-2026-57176?
3 open source packages ship an affected version, including social-auth-core.
| Package | Affected | Fixed in |
|---|---|---|
social-auth-core PyPI | All versions | 5.0.0 |
social-auth-core PyPI | All versions | 5.0.0 |
social-auth-core PyPI | All versions | 5.0.0 |
How do I fix CVE-2026-57176?
Upgrade social-auth-core to 5.0.0 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-57176 being exploited?
There is no known exploitation of CVE-2026-57176 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-57176, GHSA-fp7w-m676-w7gc, PYSEC-2026-4166, UBUNTU-CVE-2026-57176.