Description
Python Social Auth is a social authentication/registration mechanism. In versions prior to 5.6.0, upon authentication, the user could be associated by e-mail even if the `associate_by_email` pipeline was not included. This could lead to account compromise when a third-party authentication service does not validate provided e-mail addresses or doesn't require unique e-mail addresses. Version 5.6.0 contains a patch. As a workaround, review the authentication service policy on e-mail addresses; many will not allow exploiting this vulnerability.
References9
- github.com/python-social-auth/social-app-django/commit/10c80e2e…
- github.com/python-social-auth/social-app-django/issues/220
- github.com/python-social-auth/social-app-django/issues/231
- github.com/python-social-auth/social-app-django/issues/634
- github.com/python-social-auth/social-app-django/pull/803
- github.com/python-social-auth/social-app-django/security/adviso…
- github.com/python-social-auth/social-app-django/issues/220
- github.com/python-social-auth/social-app-django/issues/231
- github.com/python-social-auth/social-app-django/issues/634
Metrics
- CVSS 4.0
-
6.3
MEDIUM
Score source: CNA
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 1% percentile: 46 · as of 9 November 2026
- CWE
- CWE-303
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.