social-auth-core has a Session Fixation issue

{
  "id": "e503e32b475ef8012884322d0de740b69d7e7700550c5a7218eed93e13c977af",
  "url": "https://osv.dev/vulnerability/CVE-2026-57179",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "social-auth-core has a Session Fixation issue",
    "summary": "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.",
    "evidence": "osv:CVE-2026-57179",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-57179",
      "aliases": [
        "CVE-2026-57179",
        "GHSA-vqg6-3fw6-j9jg",
        "PYSEC-2026-4168"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/python-social-auth/social-core",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "29dffe68c7c23f3d5cb5e051e7cb40447ffb55d5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.0.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.0.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.9.1",
            "4.9.0",
            "4.8.7",
            "4.8.6",
            "4.8.5",
            "4.8.4",
            "4.8.3",
            "4.8.2",
            "4.8.1",
            "4.8.0",
            "4.7.0",
            "4.6.1",
            "4.6.0",
            "4.5.6",
            "4.5.5",
            "4.5.4",
            "4.5.3",
            "4.5.2",
            "4.5.1",
            "4.5.0",
            "4.4.2",
            "4.4.1",
            "4.4.0",
            "4.3.0",
            "4.2.0",
            "4.1.0",
            "4.0.3",
            "4.0.2",
            "4.0.1",
            "4.0.0",
            "3.4.0",
            "3.3.3",
            "3.1.0",
            "3.3.2",
            "3.3.1",
            "3.3.0",
            "3.2.0",
            "3.0.0",
            "2.0.0",
            "1.7.0",
            "1.6.0",
            "1.5.0",
            "1.4.0",
            "1.3.0",
            "1.2.0",
            "1.1.0",
            "1.0.1",
            "0.2.1",
            "0.2.0",
            "0.1.0",
            "0.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-57179.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.981018003Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57179.json",
        "https://github.com/python-social-auth/social-core/security/advisories/GHSA-vqg6-3fw6-j9jg",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-57179"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-384"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57179.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-57179",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496702,
  "published_at": "2026-09-24T17:27:00.152+00:00"
}