Lotus through 0.10.2 Improper Authentication via Event Ingestion API Key Prefix

{
  "id": "a190e2fd8526a4da861e6b7cd3dd96c232b1261659c68b575df84cb0fd6dc144",
  "url": "https://osv.dev/vulnerability/CVE-2026-115333",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Lotus through 0.10.2 Improper Authentication via Event Ingestion API Key Prefix",
    "summary": "Lotus through 0.10.2 contains an improper authentication vulnerability in the Go event ingestion middleware that validates API keys by prefix only, without checking the secret against the stored hashed_key. Attackers who know or obtain an API key prefix can submit usage events to POST /api/track/ as that organization, altering its metered usage and billing.",
    "evidence": "osv:CVE-2026-115333",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-115333",
      "aliases": [
        "CVE-2026-115333"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/uselotus/lotus",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "f908380b324045f6b160cd3245c5b632e479a63b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.10.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.10.2"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.10.2",
            "0.10.1",
            "0.10.0",
            "0.9.4",
            "0.9.3",
            "0.9.2",
            "0.9.1",
            "0.9.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-115333.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:43.576276062Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115333.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-115333",
        "https://www.vulncheck.com/advisories/lotus-through-0.10.2-improper-authentication-via-event-ingestion-api-key-prefix",
        "https://github.com/uselotus/lotus",
        "https://github.com/uselotus/lotus/blob/0.10.2/go/event-ingestion/authn/authn.go#L85-L95",
        "https://hackmd.io/@leediay/BkUc3WL2Mx"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-287"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115333.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-115333",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 511539,
  "published_at": "2026-10-22T10:57:49.499+00:00"
}