Authorization-redacted field values disclosed through AshTypescript result normalization

{
  "id": "50865f49f6071faf51993a2b6efe4d6edfeee1fa7241fc36b72dc992f24fcf15",
  "url": "https://osv.dev/vulnerability/CVE-2026-82730",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Authorization-redacted field values disclosed through AshTypescript result normalization",
    "summary": "Incorrect Authorization vulnerability in ash-project ash_typescript allows an unauthorized RPC caller to read attribute values that Ash field policies denied. When a field policy denies an attribute, Ash substitutes %Ash.ForbiddenField{}, which retains the real value in original_value because embedded resources must remain writable, and hides it from Inspect rather than removing it. AshTypescript.Rpc.ResultProcessor strips these markers to nil on its template-driven paths, but normalize_primitive/1 in lib/ash_typescript/rpc/result_processor.ex had no such clause, so a marker fell through to the generic struct branch which calls Map.from_struct/1 and serializes every key, original_value included. The denied value is returned to the caller inside the marker that represents its own denial. The simplest trigger is an action returning an embedded resource as a map, which routes through normalize_resource_struct/2 with an empty template. normalize_value_for_json/1 is a public, unguarded entry point to the same path. This issue affects ash_typescript: from 0.11.0 before 0.18.0.",
    "evidence": "osv:CVE-2026-82730",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-82730",
      "aliases": [
        "CVE-2026-82730",
        "EEF-CVE-2026-82730",
        "GHSA-6929-rjmh-4x62"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ash-project/ash_typescript",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9cade7661a01b6e4d940386f482f48d148dbb1e6"
                },
                {
                  "fixed": "aa7f9f1967b0bec806ac1156142267e805d70a55"
                },
                {
                  "introduced": "a42177bfc4acd27bb2f25372da9b3de467d6bcae"
                },
                {
                  "fixed": "808e4b17ee821a8dac98bda5bf01da0fe1b69d41"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "9cade7661a01b6e4d940386f482f48d148dbb1e6"
                      },
                      {
                        "fixed": "aa7f9f1967b0bec806ac1156142267e805d70a55"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0.11.0"
                      },
                      {
                        "fixed": "0.18.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "aa7f9f1967b0bec806ac1156142267e805d70a55"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.15.0",
            "v0.15.3",
            "v0.15.2",
            "v0.15.1",
            "v0.14.4",
            "v0.14.3",
            "v0.14.2",
            "v0.14.1",
            "v0.14.0",
            "v0.13.2",
            "v0.13.1",
            "v0.13.0",
            "v0.12.1",
            "v0.12.0",
            "v0.11.6",
            "v0.11.5",
            "v0.11.4",
            "v0.11.3",
            "v0.11.2",
            "v0.11.1",
            "v0.11.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82730.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.084271761Z",
      "provider": "osv",
      "references": [
        "https://cna.erlef.org/cves/CVE-2026-82730.html",
        "https://github.com",
        "https://osv.dev/vulnerability/EEF-CVE-2026-82730",
        "https://repo.hex.pm",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82730.json",
        "https://github.com/ash-project/ash_typescript/security/advisories/GHSA-6929-rjmh-4x62",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-82730",
        "https://github.com/ash-project/ash_typescript/commit/aa7f9f1967b0bec806ac1156142267e805d70a55",
        "https://github.com/ash-project/ash_typescript"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-863"
        ],
        "cna_assigner": "EEF",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82730.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-82730",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505279,
  "published_at": "2026-09-01T02:09:01.851+00:00"
}