ApostropheCMS: Unauthenticated resource exhaustion via pre-auth aposBigUpload processing in @apostrophecms/import-export

{
  "id": "afd70f1bccc7038b567a079a7de0c0867777ec0fd3553954d1f3bb485921702f",
  "url": "https://osv.dev/vulnerability/GHSA-86wm-68pq-5jwq",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ApostropheCMS: Unauthenticated resource exhaustion via pre-auth aposBigUpload processing in @apostrophecms/import-export",
    "summary": "## Summary A potential unauthenticated denial-of-service vulnerability exists in the chunked import upload path used by `@apostrophecms/import-export`. The affected import API routes invoke: `self.apos.http.bigUploadMiddleware()` before the actual import handler performs its authentication check. Because no `authorize` callback is supplied to `bigUploadMiddleware()`, unauthenticated requests can reach the `aposBigUpload` `start`, `chunk`, and `end` operations before the later `req.user` check rejects the import. As a result, an unauthenticated remote attacker can create server-side upload state, write chunk data to upload storage, trigger temporary-file processing, and cause attacker-controlled cleanup operations before authentication is enforced. ## Affected Component Package: `@apostrophecms/import-export` Confirmed affected version: `3.6.2` Potential earlier affected versions: The issue may affect earlier 3.x releases in which the current big-upload-based import implementation is present. I have not yet fully verified the exact introduction version and recommend that the maintainers confirm the affected version range. ## Vulnerability Type Primary: **CWE-400 — Uncontrolled Resource Consumption** Related: **CWE-306 — Missing Authentication for Critical Function** **CWE-770 — Allocation of Resources Without Limits or Throttling** ## Technical Details The page import route registers the following middleware chain: `packages/import-export/modules/@apostrophecms/import-export-p",
    "evidence": "osv:GHSA-86wm-68pq-5jwq",
    "products": [
      {
        "name": {
          "value": "apostrophe",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.33.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "@apostrophecms/import-export",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.7.0",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "GHSA-86wm-68pq-5jwq",
      "aliases": [
        "CVE-2026-113711",
        "GHSA-86wm-68pq-5jwq"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4.33.0"
                }
              ]
            }
          ],
          "package": {
            "name": "apostrophe",
            "purl": "pkg:npm/apostrophe",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-86wm-68pq-5jwq/GHSA-86wm-68pq-5jwq.json"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "3.7.0"
                }
              ]
            }
          ],
          "package": {
            "name": "@apostrophecms/import-export",
            "purl": "pkg:npm/%40apostrophecms/import-export",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-86wm-68pq-5jwq/GHSA-86wm-68pq-5jwq.json"
          }
        }
      ],
      "modified": "2026-10-21T14:00:27.319644917Z",
      "provider": "osv",
      "references": [
        "https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-86wm-68pq-5jwq",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-113711",
        "https://github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce",
        "https://github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350",
        "https://github.com/apostrophecms/apostrophe",
        "https://github.com/apostrophecms/apostrophe/releases/tag/apostrophe@4.33.0"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-400",
          "CWE-770"
        ],
        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-20T18:17:21Z",
        "github_reviewed_at": "2026-10-21T13:51:21Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-113711",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 393192,
  "published_at": "2026-10-21T13:51:21+00:00"
}