CVE-2026-82747

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When every scenario for a record was impossible, meaning no policy can authorize it and it must be forbidden, the empty-scenario branch instead kept the record (<code>{[record | data], authorizer, any_forbidden?}</code>) and returned it as authorized. As a result, records the runtime read policy denies are returned to any actor. The fix forbids a record whose scenarios are all impossible.</p>\n<p>This issue affects ash: from 3.4.44 before 3.32.2.</p>"}, {"base64": false, "type": "text/markdown", "value": "Incorrect Authorization vulnerability in ash-project ash returns records that a runtime read policy denies to any actor.\n\nWhen a resource has an `access_type :runtime` read policy (a check evaluated per record rather than compiled to a filter), `Ash.Policy.Authorizer` decides each record in `check_result/1` (`lib/ash/policy/authorizer/authorizer.ex`) by discarding impossible policy scenarios and inspecting what remains. When every scenario for a record was impossible, meaning no policy can authorize it and it must be forbidden, the empty-scenario branch instead kept the record (`{[record | data], authorizer, any_forbidden?}`) and returned it as authorized. As a result, records the runtime read policy denies are returned to any actor. The fix forbids a record whose scenarios are all impossible.\n\nThis issue affects ash: from 3.4.44 before 3.32.2."}], "value": "Incorrect Authorization vulnerability in ash-project ash returns records that a runtime read policy denies to any actor.\n\nWhen a resource has an access_type :runtime read policy (a check evaluated per record rather than compiled to a filter), Ash.Policy.Authorizer decides each record in check_result/1 (lib/ash/policy/authorizer/authorizer.ex) by discarding impossible policy scenarios and inspecting what remains. When every scenario for a record was impossible, meaning no policy can authorize it and it must be forbidden, the empty-scenario branch instead kept the record ({[record | data], authorizer, any_forbidden?}) and returned it as authorized. As a result, records the runtime read policy denies are returned to any actor. The fix forbids a record whose scenarios are all impossible.\n\nThis issue affects ash: from 3.4.44 before 3.32.2."}], "impacts": [{"capecId": "CAPEC-1", "descriptions": [{"lang": "en", "value": "CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "baseScore": 5.9, "baseSeverity": "MEDIUM", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-863", "description": "CWE-863 Incorrect Authorization", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-09-01T04:14:57.840Z"}, "references": [{"tags": ["vendor-advisory", "related"], "url": "https://github.com/ash-project/ash/security/advisories/GHSA-4259-gvr2-4xhq"}, {"tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-82747.html"}, {"tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-82747"}, {"tags": ["patch"], "url": "https://github.com/ash-project/ash/commit/6eddb8ab26e45023faf0c79ebd152bb40aefda02"}], "source": {"discovery": "EXTERNAL"}, "title": "Ash.Policy.Authorizer returns records denied by a runtime read policy to any actor"}, "adp": [{"references": [{"url": "https://github.com/ash-project/ash/security/advisories/GHSA-4259-gvr2-4xhq", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-01T12:36:21.694323Z", "id": "CVE-2026-82747", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-01T12:36:50.341Z"}}]}}

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When every scenario for a record was impossible, meaning no policy can authorize it and it must be forbidden, the empty-scenario branch instead kept the record ({[record | data], authorizer, any_forbidden?}) and returned it as authorized. As a result, records the runtime read policy denies are returned to any actor. The fix forbids a record whose scenarios are all impossible.\n\nThis issue affects ash: from 3.4.44 before 3.32.2.", "supportingMedia": [{"type": "text/html", "value": "<p>Incorrect Authorization vulnerability in ash-project ash returns records that a runtime read policy denies to any actor.</p>\n<p>When a resource has an <code>access_type :runtime</code> read policy (a check evaluated per record rather than compiled to a filter), <code>Ash.Policy.Authorizer</code> decides each record in <code>check_result/1</code> (<code>lib/ash/policy/authorizer/authorizer.ex</code>) by discarding impossible policy scenarios and inspecting what remains. 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When every scenario for a record was impossible, meaning no policy can authorize it and it must be forbidden, the empty-scenario branch instead kept the record (`{[record | data], authorizer, any_forbidden?}`) and returned it as authorized. As a result, records the runtime read policy denies are returned to any actor. 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