Apache APISIX: unauthenticated impersonation issue in saml-auth

{
  "id": "2c759f37b628d33878b79a0f1ada3c283eea9204b77d2f0071eaa4f403498a93",
  "url": "https://osv.dev/vulnerability/BIT-apisix-2026-94212",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Apache APISIX: unauthenticated impersonation issue in saml-auth",
    "summary": "Improper verification of cryptographic signature vulnerability in Apache APISIX. Any unauthenticated attacker could impersonate any user on every route protected by the saml-auth plugin under default configuration. This issue affects Apache APISIX: from 3.17.0 through 3.18.0. Users are recommended to upgrade to version 3.19.0, which fixes the issue.",
    "evidence": "osv:BIT-apisix-2026-94212",
    "products": [
      {
        "name": {
          "value": "apisix",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.19.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "BIT-apisix-2026-94212",
      "aliases": [
        "BIT-apisix-2026-94212",
        "CVE-2026-94212"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "3.17.0"
                },
                {
                  "fixed": "3.19.0"
                }
              ]
            }
          ],
          "package": {
            "name": "apisix",
            "purl": "pkg:bitnami/apisix",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V4",
              "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/apisix/BIT-apisix-2026-94212.json"
          }
        }
      ],
      "modified": "2026-10-09T12:00:03.566955986Z",
      "provider": "osv",
      "references": [
        "https://lists.apache.org/thread.html/1230fnojnmc7bfz3n0nkt7tkcld9d1sc",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-94212"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:apache:apisix:*:*:*:*:*:*:*:*"
        ],
        "severity": "Medium"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-94212",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 120644,
  "published_at": "2026-10-09T10:43:47.772+00:00"
}