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Vulnerability · Published Sep 24, 2026 · Assigned by GitHub_M

CVE-2026-57179social-auth-core has a Session Fixation issue

Medium 4.2

In plain English

A medium-severity session fixation 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 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.2Medium
Exploit odds (30 days)0.2%top 95.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Python Social Auth is a social authentication/registration mechanism. Prior to version 5.0.0, the partial-pipeline resume mechanism accepted `partial_token` as a bearer credential without binding it to the browser session that created it. Applications using resumable partial pipeline steps could allow an attacker to start an authentication flow, obtain a valid partial token and verification data, and cause a victim's browser to resume that attacker-controlled flow. This could authenticate the victim's browser as the attacker's account. The issue affects applications using partial pipeline steps such as `mail_validation` or custom steps decorated with `@partial`. The issue has been fixed in version 5.0.0 by binding partial pipeline resumes to the originating browser session.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12social-auth-coreno fix listedDEBIAN-CVE-2026-57179
Debian:13social-auth-coreno fix listedDEBIAN-CVE-2026-57179
Debian:14social-auth-core5.0.2-1DEBIAN-CVE-2026-57179
PyPIsocial-auth-core5.0.0GHSA-vqg6-3fw6-j9jg
PyPIsocial-auth-core5.0.0PYSEC-2026-4168
Ubuntu:22.04:LTSpython3.10no fix listedUBUNTU-CVE-2026-57179
Ubuntu:24.04:LTSpython3.12no fix listedUBUNTU-CVE-2026-57179
Ubuntu:26.04:LTSpython3.14no fix listedUBUNTU-CVE-2026-57179
Ubuntu:26.10python3.14no fix listedUBUNTU-CVE-2026-57179

Affected products (as reported)

VendorProductVersions
python-social-auth social-core < 5.0.0

Weakness: CWE-384 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

References