Vulnerability-Lookup

CVE-2026-86338 (GCVE-0-2026-86338)

Vulnerability from cvelistv5 – Published: 2026-09-16 08:28 – Updated: 2026-09-16 14:49

Title

Ash field policies do not filter-nil forbidden calculations and aggregates, enabling an information-disclosure oracle

Summary

Ash field_policies are documented to protect against filter-based information disclosure: when a field the actor may not see is referenced in a filter, it is replaced with an expression that evaluates to nil, so a filter cannot be used as a yes/no oracle to read a value the actor cannot see. This nilling was applied to attributes but not to calculations or aggregates. A user-supplied filter reference to a calculation or aggregate carries an Ash.Query.Calculation / Ash.Query.Aggregate struct, which the authorizer's reference replacement did not match (it only matched the Ash.Resource.* structs), so the filter ran against the real value. As a result, an actor whose field policies forbid a calculation or aggregate can still filter by it (for example filter(secret_calc == "x") or filter(comment_count == n)) and learn the value from whether rows match — an oracle that recovers field-policy-protected values one probe at a time. Filtering is commonly exposed to lower-privileged actors (for example via AshGraphql or AshJsonApi filter arguments), which is exactly the surface field policies are meant to protect. The fix routes filter references to calculations and aggregates through the same field-policy nilling as attributes. This issue affects ash: from 2.11.0-rc.0 before 3.33.4.

Severity

6 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-16 14:49 UTC

CWE

CWE-1220 - Insufficient Granularity of Access Control

Assigner

EEF mitre root

References

5 references

URL	Tags
https://github.com/ash-project/ash/security/advis…	vendor-advisory
https://cna.erlef.org/cves/CVE-2026-86338.html	related
https://osv.dev/vulnerability/EEF-CVE-2026-86338	related
https://github.com/ash-project/ash/commit/0b6d93c…	related
https://github.com/ash-project/ash/commit/b3d4503…	patch

Impacted products

2 products

Vendor	Product	Version	CPE status
ash-project	ash	Affected: 2.11.0-rc.0 , < 3.33.4 (semver) cpe:2.3:a:ash-project:ash::::::::
ash-project	ash	Affected: 0b6d93c7c4637280b46ae66ea1d2eaf013701238 , < b3d4503241f3deacb5ceb955e10a4fa927da0f67 (git) cpe:2.3:a:ash-project:ash::::::::

Credits

Jesse Williams Zach Daniel / Ash Project Jonatan Männchen / EEF Jesse Williams

Show details on NVD website

JSON

To clipboard

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    "vulnrichment": {
      "containers": "{\"cna\": {\"affected\": [{\"collectionURL\": \"https://repo.hex.pm\", \"cpes\": [\"cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*\"], \"defaultStatus\": \"unaffected\", \"modules\": [\"\u0027Elixir.Ash.Policy.Authorizer\u0027\"], \"packageName\": \"ash\", \"packageURL\": \"pkg:hex/ash\", \"product\": \"ash\", \"programFiles\": [\"lib/ash/policy/authorizer/authorizer.ex\"], \"programRoutines\": [{\"name\": \"\u0027Elixir.Ash.Policy.Authorizer\u0027:do_replace_ref/2\"}], \"repo\": \"https://github.com/ash-project/ash\", \"vendor\": \"ash-project\", \"versions\": [{\"lessThan\": \"3.33.4\", \"status\": \"affected\", \"version\": \"2.11.0-rc.0\", \"versionType\": \"semver\"}]}, {\"collectionURL\": \"https://github.com\", \"cpes\": [\"cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*\"], \"defaultStatus\": \"unaffected\", \"modules\": [\"\u0027Elixir.Ash.Policy.Authorizer\u0027\"], \"packageName\": \"ash-project/ash\", \"packageURL\": \"pkg:github/ash-project/ash\", \"product\": \"ash\", \"programFiles\": [\"lib/ash/policy/authorizer/authorizer.ex\"], \"programRoutines\": [{\"name\": \"\u0027Elixir.Ash.Policy.Authorizer\u0027:do_replace_ref/2\"}], \"repo\": \"https://github.com/ash-project/ash\", \"vendor\": \"ash-project\", \"versions\": [{\"lessThan\": \"b3d4503241f3deacb5ceb955e10a4fa927da0f67\", \"status\": \"affected\", \"version\": \"0b6d93c7c4637280b46ae66ea1d2eaf013701238\", \"versionType\": \"git\"}]}], \"configurations\": [{\"lang\": \"en\", \"supportingMedia\": [{\"base64\": false, \"type\": \"text/html\", \"value\": \"\u003cp\u003eReachable only when an application uses \u003ccode\u003eAsh.Policy.Authorizer\u003c/code\u003e field policies to restrict a calculation or aggregate, and exposes filtering on it to an actor who is denied that field (for example an authenticated user filtering through AshGraphql or AshJsonApi).\u003c/p\u003e\"}, {\"base64\": false, \"type\": \"text/markdown\", \"value\": \"Reachable only when an application uses `Ash.Policy.Authorizer` field policies to restrict a calculation or aggregate, and exposes filtering on it to an actor who is denied that field (for example an authenticated user filtering through AshGraphql or AshJsonApi).\"}], \"value\": \"Reachable only when an application uses Ash.Policy.Authorizer field policies to restrict a calculation or aggregate, and exposes filtering on it to an actor who is denied that field (for example an authenticated user filtering through AshGraphql or AshJsonApi).\"}], \"cpeApplicability\": [{\"nodes\": [{\"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*\", \"versionEndExcluding\": \"3.33.4\", \"versionStartIncluding\": \"2.11.0-rc.0\", \"vulnerable\": true}], \"negate\": false, \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Jesse Williams\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Zach Daniel / Ash Project\"}, {\"lang\": \"en\", \"type\": \"coordinator\", \"value\": \"Jonatan M\\u00e4nnchen / EEF\"}, {\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Jesse Williams\"}], \"dateAssigned\": \"2026-09-15T23:33:34.000Z\", \"descriptions\": [{\"lang\": \"en\", \"supportingMedia\": [{\"base64\": false, \"type\": \"text/html\", \"value\": \"\u003cp\u003eAsh \u003ccode\u003efield_policies\u003c/code\u003e are documented to protect against filter-based information disclosure: when a field the actor may not see is referenced in a filter, it is replaced with an expression that evaluates to \u003ccode\u003enil\u003c/code\u003e, so a filter cannot be used as a yes/no oracle to read a value the actor cannot see.\u003c/p\u003e\\n\u003cp\u003eThis nilling was applied to attributes but not to calculations or aggregates. 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Filtering is commonly exposed to lower-privileged actors (for example via AshGraphql or AshJsonApi filter arguments), which is exactly the surface field policies are meant to protect.\\n\\nThe fix routes filter references to calculations and aggregates through the same field-policy nilling as attributes.\\n\\nThis issue affects ash: from 2.11.0-rc.0 before 3.33.4.\"}], \"value\": \"Ash field_policies are documented to protect against filter-based information disclosure: when a field the actor may not see is referenced in a filter, it is replaced with an expression that evaluates to nil, so a filter cannot be used as a yes/no oracle to read a value the actor cannot see.\\n\\nThis nilling was applied to attributes but not to calculations or aggregates. 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      "cveMetadata": "{\"cveId\": \"CVE-2026-86338\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"EEF\", \"dateReserved\": \"2026-09-15T15:30:01.895Z\", \"datePublished\": \"2026-09-16T08:28:44.114Z\", \"dateUpdated\": \"2026-09-16T14:49:17.203Z\"}",
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}

FKIE_CVE-2026-86338

Vulnerability from fkie_nvd - Published: 2026-09-16 09:17 - Updated: 2026-09-16 15:18

Severity

6.0 (Medium) - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://cna.erlef.org/cves/CVE-2026-86338.html
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/ash-project/ash/commit/0b6d93c7c4637280b46ae66ea1d2eaf013701238
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/ash-project/ash/commit/b3d4503241f3deacb5ceb955e10a4fa927da0f67
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/ash-project/ash/security/advisories/GHSA-7qr8-wrvq-566q
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://osv.dev/vulnerability/EEF-CVE-2026-86338

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.Ash.Policy.Authorizer\u0027"
          ],
          "packageName": "ash",
          "packageURL": "pkg:hex/ash",
          "product": "ash",
          "programFiles": [
            "lib/ash/policy/authorizer/authorizer.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Ash.Policy.Authorizer\u0027:do_replace_ref/2"
            }
          ],
          "repo": "https://github.com/ash-project/ash",
          "vendor": "ash-project",
          "versions": [
            {
              "lessThan": "3.33.4",
              "status": "affected",
              "version": "2.11.0-rc.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.Ash.Policy.Authorizer\u0027"
          ],
          "packageName": "ash-project/ash",
          "packageURL": "pkg:github/ash-project/ash",
          "product": "ash",
          "programFiles": [
            "lib/ash/policy/authorizer/authorizer.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Ash.Policy.Authorizer\u0027:do_replace_ref/2"
            }
          ],
          "repo": "https://github.com/ash-project/ash",
          "vendor": "ash-project",
          "versions": [
            {
              "lessThan": "b3d4503241f3deacb5ceb955e10a4fa927da0f67",
              "status": "affected",
              "version": "0b6d93c7c4637280b46ae66ea1d2eaf013701238",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Ash field_policies are documented to protect against filter-based information disclosure: when a field the actor may not see is referenced in a filter, it is replaced with an expression that evaluates to nil, so a filter cannot be used as a yes/no oracle to read a value the actor cannot see.\n\nThis nilling was applied to attributes but not to calculations or aggregates. A user-supplied filter reference to a calculation or aggregate carries an Ash.Query.Calculation / Ash.Query.Aggregate struct, which the authorizer\u0027s reference replacement did not match (it only matched the Ash.Resource.* structs), so the filter ran against the real value.\n\nAs a result, an actor whose field policies forbid a calculation or aggregate can still filter by it (for example filter(secret_calc == \"x\") or filter(comment_count == n)) and learn the value from whether rows match \u2014 an oracle that recovers field-policy-protected values one probe at a time. Filtering is commonly exposed to lower-privileged actors (for example via AshGraphql or AshJsonApi filter arguments), which is exactly the surface field policies are meant to protect.\n\nThe fix routes filter references to calculations and aggregates through the same field-policy nilling as attributes.\n\nThis issue affects ash: from 2.11.0-rc.0 before 3.33.4."
    }
  ],
  "id": "CVE-2026-86338",
  "lastModified": "2026-09-16T15:18:02.030",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.0,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
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        "ssvcData": {
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            {
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          "role": "CISA Coordinator",
          "timestamp": "2026-09-16T14:49:09.195379Z",
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  "published": "2026-09-16T09:17:06.897",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://cna.erlef.org/cves/CVE-2026-86338.html"
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    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/ash-project/ash/commit/0b6d93c7c4637280b46ae66ea1d2eaf013701238"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/ash-project/ash/commit/b3d4503241f3deacb5ceb955e10a4fa927da0f67"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/ash-project/ash/security/advisories/GHSA-7qr8-wrvq-566q"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-86338"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1220"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}

GHSA-H9MG-HH48-HRWV

Vulnerability from github – Published: 2026-09-16 09:30 – Updated: 2026-09-16 09:30

Details

This nilling was applied to attributes but not to calculations or aggregates. A user-supplied filter reference to a calculation or aggregate carries an Ash.Query.Calculation / Ash.Query.Aggregate struct, which the authorizer's reference replacement did not match (it only matched the Ash.Resource.* structs), so the filter ran against the real value.

As a result, an actor whose field policies forbid a calculation or aggregate can still filter by it (for example filter(secret_calc == "x") or filter(comment_count == n)) and learn the value from whether rows match — an oracle that recovers field-policy-protected values one probe at a time. Filtering is commonly exposed to lower-privileged actors (for example via AshGraphql or AshJsonApi filter arguments), which is exactly the surface field policies are meant to protect.

The fix routes filter references to calculations and aggregates through the same field-policy nilling as attributes.

This issue affects ash: from 2.11.0-rc.0 before 3.33.4.

Severity

6.0 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-86338"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1220"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T09:17:06Z",
    "severity": "MODERATE"
  },
  "details": "Ash field_policies are documented to protect against filter-based information disclosure: when a field the actor may not see is referenced in a filter, it is replaced with an expression that evaluates to nil, so a filter cannot be used as a yes/no oracle to read a value the actor cannot see.\n\nThis nilling was applied to attributes but not to calculations or aggregates. A user-supplied filter reference to a calculation or aggregate carries an Ash.Query.Calculation / Ash.Query.Aggregate struct, which the authorizer\u0027s reference replacement did not match (it only matched the Ash.Resource.* structs), so the filter ran against the real value.\n\nAs a result, an actor whose field policies forbid a calculation or aggregate can still filter by it (for example filter(secret_calc == \"x\") or filter(comment_count == n)) and learn the value from whether rows match \u2014 an oracle that recovers field-policy-protected values one probe at a time. Filtering is commonly exposed to lower-privileged actors (for example via AshGraphql or AshJsonApi filter arguments), which is exactly the surface field policies are meant to protect.\n\nThe fix routes filter references to calculations and aggregates through the same field-policy nilling as attributes.\n\nThis issue affects ash: from 2.11.0-rc.0 before 3.33.4.",
  "id": "GHSA-h9mg-hh48-hrwv",
  "modified": "2026-09-16T09:30:28Z",
  "published": "2026-09-16T09:30:28Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ash-project/ash/security/advisories/GHSA-7qr8-wrvq-566q"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86338"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ash-project/ash/commit/0b6d93c7c4637280b46ae66ea1d2eaf013701238"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ash-project/ash/commit/b3d4503241f3deacb5ceb955e10a4fa927da0f67"
    },
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-86338.html"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-86338"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/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",
      "type": "CVSS_V4"
    }
  ]
}

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Action not permitted

CVE-2026-86338 (GCVE-0-2026-86338)

FKIE_CVE-2026-86338

GHSA-H9MG-HH48-HRWV

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