Python Social Auth is a social authentication/registration mechanism. Prior to 5.0.2, the LINE backend exchanges an authorization code without validating the returned OAuth state. An attacker can begin authorization for an attacker-controlled LINE account and induce a victim to visit the resulting callback URL, causing the application to log the victim into the attacker's account.
When account linking is enabled, the same missing validation can link the attacker's LINE identity to the victim's existing account and create a persistent unauthorized login path. Only applications with the LINE backend enabled are affected. This issue is fixed in version 5.0.2.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
None
No data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://github.com/python-social-auth/social-core/commit/5b3b90d07ebccc1f5b0764…
security-advisories@github.com
https://github.com/python-social-auth/social-core/pull/1829
security-advisories@github.com
https://github.com/python-social-auth/social-core/releases/tag/5.0.2
security-advisories@github.com
https://github.com/python-social-auth/social-core/security/advisories/GHSA-526j…
security-advisories@github.com