Apache APISIX: cas-auth login CSRF / session injection issue

{
  "id": "e2e1ffe4fec4ea9b8b31e0848c29e907c091002cc53575dcde14d19b85103142",
  "url": "https://osv.dev/vulnerability/CVE-2026-49871",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Apache APISIX: cas-auth login CSRF / session injection issue",
    "summary": "Cross-Site Request Forgery (CSRF) vulnerability in the cas-auth plugin under default configurations. This defect allows a remote attacker that manages to send a victim to a webpage controlled by them can cause the victim's browser to become authenticated as a different identity. Actions the victim takes upstream are then attributed to attackers identity. This issue affects Apache APISIX: from 3.0.0 through 3.16.0. Users are recommended to upgrade to version 3.17.0, which fixes the issue.",
    "evidence": "osv:CVE-2026-49871",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-49871",
      "aliases": [
        "BIT-apisix-2026-49871",
        "CVE-2026-49871"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/apache/apisix",
              "type": "GIT",
              "events": [
                {
                  "introduced": "24d1ec762e4bee402cc98b5ca57a08531f3c0b51"
                },
                {
                  "fixed": "9ef2ecab67f652d38365049613610ef649bb4ad0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:apache:apisix:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.0.0"
                      },
                      {
                        "fixed": "3.17.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49871.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:48.678674930Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49871.json",
        "https://lists.apache.org/thread/1ozsnss0lof4gpwq763d66oxwxt3sycp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-49871"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-352"
        ],
        "cna_assigner": "apache",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "3.0.0"
                  },
                  {
                    "last_affected": "3.16.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49871.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-49871",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517106,
  "published_at": "2026-06-19T13:18:36.767+00:00"
}