{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "2.7.3"
              },
              {
                "fixed": "5.0.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "c69b9547c942c697da2f3ee6a9265b6004abd645"
            }
          ],
          "repo": "https://github.com/chillzhuang/springblade",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-862"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56100.json"
  },
  "details": "SpringBlade versions from 2.7.3 up to but not including 5.0.0 contain a privilege escalation vulnerability that allows authenticated attackers to create system administrator accounts by sending crafted POST requests to an unprotected internal Feign user-creation endpoint exposed via @RestController without authorization checks. Attackers can exploit the gateway's authentication filter, which only validates JWT parsing without verifying user roles or caller identity, and leverage a hardcoded JWT signing key embedded in publicly available JARs to forge tokens and escalate privileges from a low-privilege user to administrator, enabling cross-tenant data pollution and persistent backdoor access.",
  "id": "CVE-2026-56100",
  "modified": "2026-08-31T03:30:41.744463952Z",
  "published": "2026-08-28T18:00:36.953Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://gitee.com/smallc/SpringBlade"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56100.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56100"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/springblade-privilege-escalation-via-exposed-feign-endpoint"
    },
    {
      "type": "FIX",
      "url": "https://github.com/chillzhuang/SpringBlade/commit/c69b9547c942c697da2f3ee6a9265b6004abd645"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/chillzhuang/SpringBlade"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/chillzhuang/SpringBlade/releases#release-v5.0.0"
    },
    {
      "type": "EVIDENCE",
      "url": "https://gist.github.com/sud0why/e73405057dd7414a8c221ef17e0d0059#file-cve-2026-56100-springblade-authbypass-en-md"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "SpringBlade 2.7.3 \u003c 5.0.0 Privilege Escalation via Exposed Feign Endpoint"
}