ApostropheCMS: POST /api/v1/@apostrophecms/doc/slugTaken discloses existence of private/admin-only content to any authenticated user

{
  "id": "427359809a53c9e115641450ba6567c45b3f55621a09721b0e39eab1a325f064",
  "url": "https://osv.dev/vulnerability/GHSA-f66c-mpj2-3r8h",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ApostropheCMS: POST /api/v1/@apostrophecms/doc/slugTaken discloses existence of private/admin-only content to any authenticated user",
    "summary": "### Summary The `slugTaken` endpoint returns a boolean indicating whether a slug is in use across all document types and visibility levels, with no permission or type filter. Any logged-in user (including editors) can enumerate the slug space of private pages, drafts, and archived content. ### Details `POST /api/v1/@apostrophecms/doc/slugTaken` with body `{ \"slug\": \"target-slug\" }` runs a raw existence check against the documents collection. It does not: - Check whether the requesting user has read permission for documents of that type. - Filter by `visibility` (public, loginRequired, private). - Filter by `viewRole`. - Filter by publication status (draft vs published). A single authenticated session can iterate the slug space to enumerate the full content inventory of the CMS, including content the user is explicitly prohibited from viewing. ### PoC ```bash # Any authenticated session works — editor role sufficient curl -b \"$EDITOR_JAR\" -X POST \\ -H \"Content-Type: application/json\" \\ -d '{\"slug\":\"known-private-page-slug\"}' \\ \"http://TARGET/api/v1/@apostrophecms/doc/slugTaken\" # → { \"taken\": true } — confirms private page exists curl -b \"$EDITOR_JAR\" -X POST \\ -H \"Content-Type: application/json\" \\ -d '{\"slug\":\"zzz-nonexistent\"}' \\ \"http://TARGET/api/v1/@apostrophecms/doc/slugTaken\" # → { \"taken\": false } ``` ### Impact Information disclosure. An attacker with any authenticated session can enumerate all slugs in the system, mapping the full content structure of the CMS includi",
    "evidence": "osv:GHSA-f66c-mpj2-3r8h",
    "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-f66c-mpj2-3r8h",
      "aliases": [
        "CVE-2026-112952",
        "GHSA-f66c-mpj2-3r8h"
      ],
      "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-f66c-mpj2-3r8h/GHSA-f66c-mpj2-3r8h.json"
          }
        }
      ],
      "modified": "2026-10-21T17:28:20.174275549Z",
      "provider": "osv",
      "references": [
        "https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-f66c-mpj2-3r8h",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-112952",
        "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-200"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-20T16:17:06Z",
        "github_reviewed_at": "2026-10-21T17:17:00Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-112952",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 397801,
  "published_at": "2026-10-21T17:17:00+00:00"
}