Vulnerability in Python-Social-Auth Social-Core
CVE-2026-57176
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.
Published .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Python-Social-Auth Social-Core — versions < 5.0.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-57176?
- CVE-2026-57176 is a medium-severity vulnerability in Python-Social-Auth Social-Core, classified under CWE-289. CVSS score: 6.8/10. Published 2026-09-24.
- How severe is CVE-2026-57176?
- Medium severity. CVSS v3 base score is 6.8 out of 10.