{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.1.0"
              },
              {
                "fixed": "1.3.1"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "d99db5e821f4eebd45b96a4ed169f949d43b69d6"
            },
            {
              "fixed": "91da87c1c23cd6199ba1b0a1c8849a4c605130cc"
            },
            {
              "fixed": "3c3e905d47f1155dcc1ca3fb347348b05a66065a"
            }
          ],
          "repo": "https://github.com/ash-project/ash_admin",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-jxr8-hpv2-qp38"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-639"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81853.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "98b03baa8422b94dd13e305bf08b8ee3f7232c7b"
          },
          {
            "fixed": "3c3e905d47f1155dcc1ca3fb347348b05a66065a"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Authorization Bypass Through User-Controlled Key vulnerability in ash-project ash_admin turns a record-lookup URL into an equality oracle over sensitive attributes.\n\nAshAdmin.Helpers.decode_primary_key/2 decodes the composite-primary-key form (Base64 plus ETF) and returns the decoded map verbatim as the lookup filter, without checking that its keys are the resource's primary-key fields. The deserialization guards bound size, block new atoms and funs, and reject nested expressions, but none restricts which fields come back, and :safe still allows any already-interned attribute name. An attacker can therefore encode %{api_token: \"guess\"} and have it spliced into the lookup filter, brute-forcing a sensitive attribute value (API token, reset token) one equality guess at a time; Map.to_list/1 also accepts structs, yielding a bogus __struct__ key. The fix rejects any decoded key that is not a real primary-key field.\n\nThis issue affects ash_admin: from 0.1.0 before 1.3.1.",
  "id": "CVE-2026-81853",
  "modified": "2026-09-03T03:30:23.424513130Z",
  "published": "2026-08-31T02:31:29.547Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-81853.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-81853"
    },
    {
      "type": "WEB",
      "url": "https://repo.hex.pm"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81853.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/ash-project/ash_admin/security/advisories/GHSA-jxr8-hpv2-qp38"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-81853"
    },
    {
      "type": "FIX",
      "url": "https://github.com/ash-project/ash_admin/commit/3c3e905d47f1155dcc1ca3fb347348b05a66065a"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ash-project/ash_admin"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "AshAdmin composite primary key decoding accepts arbitrary fields, enabling a secret-attribute oracle"
}