Security advisory

{
  "id": "4eb34bef5946c72b9c0a68c6a57876ba0ee547f1e00e9b50d251ef6297943b19",
  "url": "https://osv.dev/vulnerability/CVE-2021-43787",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-43787",
    "summary": "Nodebb is an open source Node.js based forum software. In affected versions a prototype pollution vulnerability in the uploader module allowed a malicious user to inject arbitrary data (i.e. javascript) into the DOM, theoretically allowing for an account takeover when used in conjunction with a path traversal vulnerability disclosed at the same time as this report. The vulnerability has been patched as of v1.18.5. Users are advised to upgrade as soon as possible.",
    "evidence": "osv:CVE-2021-43787",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-43787",
      "aliases": [
        "CVE-2021-43787",
        "GHSA-wx69-rvg3-x7fc"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nodebb/nodebb",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e8ca993aac4b90cfea131050814a19e144a27094"
                },
                {
                  "last_affected": "abbbc3d7c2c75a7877ee55debb9f47114e692778"
                },
                {
                  "fixed": "1783f918bc19568f421473824461ff2ed7755e4c"
                },
                {
                  "fixed": "c28ac8ec52910c4f9fffec5fb11de2705126c790"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nodebb:nodebb:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.15.5"
                      },
                      {
                        "last_affected": "1.18.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "1783f918bc19568f421473824461ff2ed7755e4c"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c28ac8ec52910c4f9fffec5fb11de2705126c790"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.18.5"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43787.json"
          }
        }
      ],
      "modified": "2026-10-20T10:55:03.201393300Z",
      "provider": "osv",
      "references": [
        "https://github.com/NodeBB/NodeBB/commit/1783f918bc19568f421473824461ff2ed7755e4c",
        "https://github.com/NodeBB/NodeBB/releases/tag/v1.18.5",
        "https://github.com/NodeBB/NodeBB/security/advisories/GHSA-wx69-rvg3-x7fc",
        "https://blog.sonarsource.com/nodebb-remote-code-execution-with-one-shot/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-43787",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386787,
  "published_at": "2021-11-29T20:15:08.19+00:00"
}