Vulnerability · Published Sep 24, 2026 · Assigned by GitHub_M
CVE-2026-57175social-auth-core has an Improper Authentication issue
Medium 6.4
In plain English
A medium-severity improper authentication in social-core from python-social-auth. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | social-auth-core | no fix listed | DEBIAN-CVE-2026-57175 |
| Debian:13 | social-auth-core | no fix listed | DEBIAN-CVE-2026-57175 |
| Debian:14 | social-auth-core | 5.0.2-1 | DEBIAN-CVE-2026-57175 |
| PyPI | social-auth-core | 5.0.0 | GHSA-vq6g-g6c7-5f2j |
| PyPI | social-auth-core | 5.0.0 | PYSEC-2026-4167 |
| Ubuntu:22.04:LTS | python3.10 | no fix listed | UBUNTU-CVE-2026-57175 |
| Ubuntu:24.04:LTS | python3.12 | no fix listed | UBUNTU-CVE-2026-57175 |
| Ubuntu:26.04:LTS | python3.14 | no fix listed | UBUNTU-CVE-2026-57175 |
| Ubuntu:26.10 | python3.14 | no fix listed | UBUNTU-CVE-2026-57175 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| python-social-auth | social-core | < 5.0.0 |
Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N