CVE-2026-96581

{
  "id": "CVE-2026-96581",
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "published": "2026-10-26T08:17:20.423",
  "lastModified": "2026-10-26T15:16:47.257",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Authorization Bypass Through User-Controlled Key vulnerability in ash-project ash allows a user of one tenant to read, overwrite and take over another tenant's records via an upserting create action.\n\nUnder attribute multitenancy, Ash.Actions.Create (lib/ash/actions/create/create.ex) and Ash.Actions.Create.Bulk (lib/ash/actions/create/bulk.ex) upserted on the primary key, or on an all_tenants? identity, without scoping the conflicting record to the request's tenant. A caller of a create action with upsert? true that accepts the primary key, supplying a record id from another tenant, updated that record's upsert fields and received all of its attributes in the result. With the default upsert fields the tenant attribute was written too, moving the record into the caller's tenant. Read and update policies do not run for upserts, and tenant-scoped create policies pass because the tenant is the caller's own.\n\nThis issue affects ash: from 1.22.0 before 3.37.2."
    }
  ],
  "affected": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "affectedData": [
        {
          "vendor": "ash-project",
          "product": "ash",
          "defaultStatus": "unaffected",
          "collectionURL": "https://repo.hex.pm",
          "packageName": "ash",
          "cpes": [
            "cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "'Elixir.Ash.Actions.Create'",
            "'Elixir.Ash.Actions.Create.Bulk'",
            "'Elixir.Ash.DataLayer.Ets'",
            "'Elixir.Ash.DataLayer.Mnesia'"
          ],
          "programFiles": [
            "lib/ash/actions/create/create.ex",
            "lib/ash/actions/create/bulk.ex",
            "lib/ash/data_layer/ets/ets.ex",
            "lib/ash/data_layer/mnesia/mnesia.ex"
          ],
          "programRoutines": [
            {
              "name": "'Elixir.Ash.Actions.Create':run/4"
            },
            {
              "name": "'Elixir.Ash.Actions.Create.Bulk':run/5"
            },
            {
              "name": "'Elixir.Ash.DataLayer.Ets':upsert/4"
            },
            {
              "name": "'Elixir.Ash.DataLayer.Mnesia':upsert/4"
            }
          ],
          "repo": "https://github.com/ash-project/ash",
          "packageURL": "pkg:hex/ash",
          "versions": [
            {
              "version": "1.22.0",
              "lessThan": "3.37.2",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "ash-project",
          "product": "ash",
          "defaultStatus": "unaffected",
          "collectionURL": "https://github.com",
          "packageName": "ash-project/ash",
          "cpes": [
            "cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "'Elixir.Ash.Actions.Create'",
            "'Elixir.Ash.Actions.Create.Bulk'",
            "'Elixir.Ash.DataLayer.Ets'",
            "'Elixir.Ash.DataLayer.Mnesia'"
          ],
          "programFiles": [
            "lib/ash/actions/create/create.ex",
            "lib/ash/actions/create/bulk.ex",
            "lib/ash/data_layer/ets/ets.ex",
            "lib/ash/data_layer/mnesia/mnesia.ex"
          ],
          "programRoutines": [
            {
              "name": "'Elixir.Ash.Actions.Create':run/4"
            },
            {
              "name": "'Elixir.Ash.Actions.Create.Bulk':run/5"
            },
            {
              "name": "'Elixir.Ash.DataLayer.Ets':upsert/4"
            },
            {
              "name": "'Elixir.Ash.DataLayer.Mnesia':upsert/4"
            }
          ],
          "repo": "https://github.com/ash-project/ash",
          "packageURL": "pkg:github/ash-project/ash",
          "versions": [
            {
              "version": "2333d01ddf37e5909769a513059b27e3183331c5",
              "lessThan": "c9f0cdb31e7c084def05f3f5be69dd7bb7721754",
              "versionType": "git",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "baseScore": 7.6,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-26T14:25:41.244972Z",
          "id": "CVE-2026-96581",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-639"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://cna.erlef.org/cves/CVE-2026-96581.html",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/ash-project/ash/commit/2333d01ddf37e5909769a513059b27e3183331c5",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/ash-project/ash/commit/c9f0cdb31e7c084def05f3f5be69dd7bb7721754",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/ash-project/ash/security/advisories/GHSA-vw7c-67pf-gh96",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-96581",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ]
}