Security advisory

{
  "id": "27927d9af846cb91881f9b5af69d9e7020d87a58c889a48a7f3f2c107306e499",
  "url": "https://osv.dev/vulnerability/CVE-2021-27884",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-27884",
    "summary": "Weak JSON Web Token (JWT) signing secret generation in YMFE YApi through 1.9.2 allows recreation of other users' JWT tokens. This occurs because Math.random in Node.js is used.",
    "evidence": "osv:CVE-2021-27884",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-27884",
      "aliases": [
        "CVE-2021-27884",
        "GHSA-2h3h-vw8r-82rp"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ymfe/yapi",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "ff13353e2fd6e2c37908427dd2e6d287ef8d28ec"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ymfe:yapi:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.9.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.9.2",
            "v1.9.1",
            "v1.9.0",
            "v1.8.8",
            "v1.8.7",
            "v1.8.5",
            "v1.8.4",
            "v1.8.3",
            "v1.8.2",
            "v1.8.1",
            "v1.8.0",
            "v1.7.2",
            "v1.7.1",
            "v1.7.0",
            "v1.7.0-beta.1",
            "v1.7.0-beta.0",
            "v1.5.13",
            "v1.5.12",
            "v1.5.11",
            "v1.5.10",
            "v1.5.7",
            "v1.5.6",
            "v1.5.5",
            "v1.5.4",
            "v1.5.3",
            "v1.5.2",
            "v1.5.1",
            "v1.5.0",
            "v1.4.4",
            "v1.4.3",
            "v1.3.14",
            "v1.3.13",
            "v1.3.12",
            "v1.3.11",
            "v1.3.10",
            "v1.3.9",
            "v1.3.7",
            "v1.3.6",
            "v1.3.5",
            "v1.3.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-27884.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:35.649018060Z",
      "provider": "osv",
      "references": [
        "https://github.com/YMFE/yapi/issues/2117",
        "https://securitylab.github.com/advisories/GHSL-2020-228-YMFE-yapi"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-27884",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385685,
  "published_at": "2021-03-01T23:15:13.267+00:00"
}