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CVE-2026-57175: CWE-287: Improper Authentication in python-social-auth social-core

0
Medium
VulnerabilityCVE-2026-57175cvecve-2026-57175cwe-287
Published: 09/24/2026 (09/24/2026, 17:11:49 UTC)
Source: CVE Database V5
Vendor/Project: python-social-auth
Product: social-core

Description

Python Social Auth is a social authentication/registration mechanism. Prior to version 5.0.0, the SAML backend accepted SAML responses on the Assertion Consumer Service endpoint without verifying that they matched a previously issued `AuthnRequest`. Applications using SAML account association could allow an attacker with a valid account on a trusted IdP to link the attacker's SAML identity to a logged-in victim's local account. The attacker could then authenticate through SAML and gain access to the victim's account. The issue affects applications using the SAML backend together with authenticated account association. The issue has been fixed in version 5.0.0 by validating SAML responses against stored `AuthnRequest` IDs.

CVSS v3.1

Score 6.4medium

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

Affected software

python-social-auth

social-core

Affected versions
<5.0.0

Technical Details

Data Version
5.2
Assigner Short Name
GitHub_M
Date Reserved
2026-06-24T01:47:55.286Z
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6ab55b82f7a7c5410699e8ed

Added to database: 09/24/2026, 17:18:58 UTC

Last updated: 09/24/2026, 17:18:58 UTC

Views: 1

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