ApostropheCMS: GET /api/v1/@apostrophecms/page/:id bypasses viewRole restriction and exposes viewPermission-gated fields to lower-privileged users

{
  "id": "aff1f30766c59f6a459bd442bf649a79be5ce09b7385162a0cc8f03c83be4633",
  "url": "https://osv.dev/vulnerability/GHSA-vh56-5m88-39rq",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ApostropheCMS: GET /api/v1/@apostrophecms/page/:id bypasses viewRole restriction and exposes viewPermission-gated fields to lower-privileged users",
    "summary": "### Summary The `getOne` REST endpoint for pages does not apply `viewRole` type-level restrictions or `viewPermission` field-level redaction. An editor-level user who knows a document `_id` can read the full content of admin-only pages and their privileged fields, while the `getAll` endpoint correctly enforces both restrictions. ### Details **Finding 3 — viewRole bypass:** `modules/@apostrophecms/page/index.js` exposes `getRestQuery(req, omitPermissionCheck = false)`. The `getAll` path calls `publicApiCheckAsync` and threads the full query builder pipeline including `viewRole` filtering. The `getOne` path uses a divergent code path that skips this pipeline. A page type declared with `viewRole: 'admin'` is inaccessible via `GET /api/v1/@apostrophecms/page?type=secretPage` (returns 403 to an editor) but is fully returned by `GET /api/v1/@apostrophecms/page/:id:en:published` to the same editor. **Finding 4 — viewPermission field leak:** Fields decorated with `viewPermission: { action: 'edit', type: '@apostrophecms/page' }` are stripped by `removeForbiddenFields` in the `getAll` path but are returned verbatim in `getOne`. An editor who knows any document `_id` can read all `viewPermission`-restricted fields. ### PoC ```bash # Log in as editor, get session jar EDITOR_JAR=\"...\" # getAll — correctly blocked curl -b \"$EDITOR_JAR\" \\ \"http://TARGET/api/v1/@apostrophecms/page?type=secretPage\" # → 403 Forbidden # getOne — bypassed, returns full document including viewPermission fields cu",
    "evidence": "osv:GHSA-vh56-5m88-39rq",
    "products": [
      {
        "name": {
          "value": "apostrophe",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.34.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-vh56-5m88-39rq",
      "aliases": [
        "CVE-2026-112957",
        "GHSA-vh56-5m88-39rq"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4.34.0"
                }
              ]
            }
          ],
          "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-vh56-5m88-39rq/GHSA-vh56-5m88-39rq.json"
          }
        }
      ],
      "modified": "2026-10-21T17:28:22.096678767Z",
      "provider": "osv",
      "references": [
        "https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-vh56-5m88-39rq",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-112957",
        "https://github.com/apostrophecms/apostrophe/commit/06e4b377f3c360f9e89c32dccd7e505ad5ddf498",
        "https://github.com/apostrophecms/apostrophe/commit/40b989b1a9dd23d30029b8ce7668634265cfe5ea",
        "https://github.com/apostrophecms/apostrophe",
        "https://github.com/apostrophecms/apostrophe/releases/tag/apostrophe@4.34.0"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-20T17:17:33Z",
        "github_reviewed_at": "2026-10-21T17:15:21Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-112957",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 397803,
  "published_at": "2026-10-21T17:15:21+00:00"
}