social-core up to 4.x SAML Backend improper authentication

Summaryinfo

A vulnerability categorized as critical has been discovered in social-core up to 4.x. This affects an unknown function of the component SAML Backend. Executing a manipulation can lead to improper authentication. This vulnerability appears as CVE-2026-57175. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in social-core up to 4.x and classified as critical. This vulnerability affects an unknown functionality of the component SAML Backend. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-57175 since 06/24/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 5.0.0 eliminates this vulnerability.

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Productinfo

Name

• social-core

Version

• 4.x

CPE 2.3info

• 🔒

CPE 2.2info

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