ZKEACMS through 4.4 Authentication Bypass via Hard-Coded JWT Signing Key

{
  "id": "a2314e287b02d8398193b1e168600cb5128cdad19c6ae2539c5046a88314d960",
  "url": "https://osv.dev/vulnerability/CVE-2026-111633",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ZKEACMS through 4.4 Authentication Bypass via Hard-Coded JWT Signing Key",
    "summary": "ZKEACMS through 4.4 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge REST API JWT bearer tokens using a hard-coded HMAC-SHA256 signing key in JwtBearerDefaults.cs. Attackers can sign a token with the Name claim set to 'admin' to call ApiAuthorize endpoints, modifying articles and products and reading form submissions.",
    "evidence": "osv:CVE-2026-111633",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-111633",
      "aliases": [
        "CVE-2026-111633"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/seriawei/zkeacms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "2c21b31322b630bb364c67ab71fbd698e9ff4280"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "4.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "4.4"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.4",
            "v4.3",
            "v3.9.4",
            "v3.9.3",
            "v3.9.2",
            "v3.9.1",
            "v3.9",
            "v3.8",
            "v3.7",
            "v3.6.2",
            "v3.6.1",
            "v3.6",
            "v3.5.6",
            "v3.5.5",
            "v3.5.4",
            "v3.5.2",
            "v3.5.1",
            "v3.5",
            "v3.4.5",
            "v3.4.4",
            "v3.4.3",
            "v3.4.2",
            "v3.4.1",
            "v3.4",
            "v3.3.7",
            "v3.3.6",
            "v3.3.5",
            "v3.3.4",
            "v3.3.3",
            "v3.2.0",
            "v3.3.2",
            "v3.3.1.0",
            "v3.3.1",
            "v3.3",
            "v3.2.3",
            "v3.2.2",
            "v3.2.1",
            "v3.1.9",
            "v3.1.7",
            "v3.1.5",
            "v3.1.4",
            "v3.1.3",
            "v1.2",
            "v1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111633.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.172295646Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111633.json",
        "https://hackmd.io/@hieuPenguinnn/zkeacms-hardcoded-jwt-signing-key-admin-auth-bypass",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-111633",
        "https://www.vulncheck.com/advisories/zkeacms-through-4.4-authentication-bypass-via-hard-coded-jwt-signing-key",
        "https://github.com/SeriaWei/ZKEACMS/issues/531",
        "https://github.com/SeriaWei/ZKEACMS",
        "https://github.com/SeriaWei/ZKEACMS/blob/v4.4/src/ZKEACMS/Api/JwtBearerDefaults.cs#L14-L19",
        "https://github.com/SeriaWei/ZKEACMS/blob/v4.4/src/ZKEACMS/BuilderAuthentication.cs#L41-L52"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-321"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111633.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-111633",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507791,
  "published_at": "2026-10-16T17:39:06.226+00:00"
}