ApostropheCMS uploadfs Azure backend leaks account-level SAS token into every public attachment URL (sas: true)

{
  "id": "2dec09e9fc6ea001d652cebca6c80ee13355e08d06c7372d004e7ebdea01ab74",
  "url": "https://osv.dev/vulnerability/GHSA-hhph-8536-gfq5",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ApostropheCMS uploadfs Azure backend leaks account-level SAS token into every public attachment URL (sas: true)",
    "summary": "## Summary When uploadfs is configured with the Azure backend and `sas: true` (a supported configuration introduced in uploadfs 1.25.0), `createContainer()` builds the `BlobServiceClient` from a URL that embeds the full SAS query string, and Azure SDK v12 derived clients inherit that query string. As a result, `getUrl()` returns a base URL carrying the complete account/container SAS signature (`?sv=...&sig=...`), and Apostrophe's `attachment.url()` prepends it to every public attachment link — broadcasting a container-level SAS credential (commonly `sp=rwdlac`, full read/write/delete/list) to every site visitor, including anonymous ones. Anyone who can see an attachment URL can read, overwrite, delete, and list every blob in the container for the SAS lifetime. A companion functional bug (blob path appended after the query string, producing broken URLs) shows this code path was never exercised end to end. Shared-key mode (default) and non-Azure backends are not affected. Verified at commit `5a3746aaed49761e171c2cbfe793267c959829fd` (uploadfs 1.27.0 in the apostrophe monorepo). ## Details Root cause: a credential-bearing client URL is reused as the public base URL. The chain: - Credential-embedded client: [azure.js#L123-L125](https://github.com/apostrophecms/apostrophe/blob/5a3746aaed49761e171c2cbfe793267c959829fd/packages/uploadfs/lib/storage/azure.js#L123-L125) — `new BlobServiceClient(\"https://.blob.core.windows.net?\")` where `cluster.key` is the full SAS string including `s",
    "evidence": "osv:GHSA-hhph-8536-gfq5",
    "products": [
      {
        "name": {
          "value": "uploadfs",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.28.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-hhph-8536-gfq5",
      "aliases": [
        "CVE-2026-113652",
        "GHSA-hhph-8536-gfq5"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "1.25.0"
                },
                {
                  "fixed": "1.28.0"
                }
              ]
            }
          ],
          "package": {
            "name": "uploadfs",
            "purl": "pkg:npm/uploadfs",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-hhph-8536-gfq5/GHSA-hhph-8536-gfq5.json"
          }
        }
      ],
      "modified": "2026-10-20T18:30:03.590258002Z",
      "provider": "osv",
      "references": [
        "https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-hhph-8536-gfq5",
        "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/uploadfs@1.28.0"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-200",
          "CWE-522"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": null,
        "github_reviewed_at": "2026-10-20T18:20:35Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-113652",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 390146,
  "published_at": "2026-10-20T18:20:35+00:00"
}