{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-115635", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-10-23T13:00:02.145Z", "datePublished": "2026-10-25T19:48:43.829Z", "dateUpdated": "2026-10-25T19:48:43.829Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.AshPostgres.DataLayer'"], "packageName": "ash_postgres", "packageURL": "pkg:hex/ash_postgres", "product": "ash_postgres", "programFiles": ["lib/data_layer.ex"], "programRoutines": [{"name": "'Elixir.AshPostgres.DataLayer':do_bulk_create/3"}, {"name": "'Elixir.AshPostgres.DataLayer':upsert/4"}, {"name": "'Elixir.AshPostgres.DataLayer':bulk_create/3"}], "repo": "https://github.com/ash-project/ash_postgres", "vendor": "ash-project", "versions": [{"lessThan": "2.15.2", "status": "affected", "version": "2.6.22", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.AshPostgres.DataLayer'"], "packageName": "ash-project/ash_postgres", "packageURL": "pkg:github/ash-project/ash_postgres", "product": "ash_postgres", "programFiles": ["lib/data_layer.ex"], "programRoutines": [{"name": "'Elixir.AshPostgres.DataLayer':do_bulk_create/3"}, {"name": "'Elixir.AshPostgres.DataLayer':upsert/4"}, {"name": "'Elixir.AshPostgres.DataLayer':bulk_create/3"}], "repo": "https://github.com/ash-project/ash_postgres", "vendor": "ash-project", "versions": [{"lessThan": "8aa81220c401cae412d21078d11b3519ea25d3a9", "status": "affected", "version": "af0903f1380468bbe1b61fe65acb33772b5e24a5", "versionType": "git"}]}], "configurations": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Reachable when a resource uses attribute multitenancy, an action performs upserts with <code>return_skipped_upsert?: true</code>, and a caller can supply identity values that another tenant also uses.</p>"}, {"base64": false, "type": "text/markdown", "value": "Reachable when a resource uses attribute multitenancy, an action performs upserts with `return_skipped_upsert?: true`, and a caller can supply identity values that another tenant also uses."}], "value": "Reachable when a resource uses attribute multitenancy, an action performs upserts with return_skipped_upsert?: true, and a caller can supply identity values that another tenant also uses."}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.15.2", "versionStartIncluding": "2.6.22", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}], "credits": [{"lang": "en", "type": "finder", "value": "Will Townsend"}, {"lang": "en", "type": "reporter", "value": "Will Townsend"}, {"lang": "en", "type": "remediation developer", "value": "Zach Daniel / Ash Project"}], "dateAssigned": "2026-10-25T17:27:42.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Incorrect Authorization vulnerability in ash-project ash_postgres allows a user to read another tenant's record through a skipped upsert.</p>\n<p>When <code>Ash.bulk_create/4</code> or a single create runs as an upsert with <code>return_skipped_upsert?: true</code> and the upsert is skipped (for example because its <code>upsert_condition</code> does not hold), <code>AshPostgres.DataLayer</code> reads the existing row back by the upsert identity in <code>do_bulk_create/3</code> and <code>upsert/4</code>. That lookup did not apply the resource's attribute multitenancy, so on a resource using <code>strategy :attribute</code> it could match and return the row of another tenant with the same identity values, exposing its fields to the caller.</p>\n<p>This issue affects ash_postgres: from 2.6.22 before 2.15.2.</p>"}, {"base64": false, "type": "text/markdown", "value": "Incorrect Authorization vulnerability in ash-project ash_postgres allows a user to read another tenant's record through a skipped upsert.\n\nWhen `Ash.bulk_create/4` or a single create runs as an upsert with `return_skipped_upsert?: true` and the upsert is skipped (for example because its `upsert_condition` does not hold), `AshPostgres.DataLayer` reads the existing row back by the upsert identity in `do_bulk_create/3` and `upsert/4`. That lookup did not apply the resource's attribute multitenancy, so on a resource using `strategy :attribute` it could match and return the row of another tenant with the same identity values, exposing its fields to the caller.\n\nThis issue affects ash_postgres: from 2.6.22 before 2.15.2."}], "value": "Incorrect Authorization vulnerability in ash-project ash_postgres allows a user to read another tenant's record through a skipped upsert.\n\nWhen Ash.bulk_create/4 or a single create runs as an upsert with return_skipped_upsert?: true and the upsert is skipped (for example because its upsert_condition does not hold), AshPostgres.DataLayer reads the existing row back by the upsert identity in do_bulk_create/3 and upsert/4. That lookup did not apply the resource's attribute multitenancy, so on a resource using strategy :attribute it could match and return the row of another tenant with the same identity values, exposing its fields to the caller.\n\nThis issue affects ash_postgres: from 2.6.22 before 2.15.2."}], "impacts": [{"capecId": "CAPEC-1", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>A user of one tenant whose upsert is skipped receives another tenant's record with the same identity values.</p>"}, {"base64": false, "type": "text/markdown", "value": "A user of one tenant whose upsert is skipped receives another tenant's record with the same identity values."}], "value": "A user of one tenant whose upsert is skipped receives another tenant's record with the same identity values."}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 6, "baseSeverity": "MEDIUM", "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", "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": "2026-10-25T19:48:43.829Z"}, "references": [{"name": "`Ash.bulk_create` with `return_skipped_upsert?: true` in AshPostgres returns another tenant's record for a skipped upsert", "tags": ["vendor-advisory", "related"], "url": "https://github.com/ash-project/ash/security/advisories/GHSA-36hg-wwp2-fg8w"}, {"name": "EEF CNA record for CVE-2026-115635", "tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-115635.html"}, {"name": "OSV record EEF-CVE-2026-115635", "tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-115635"}, {"name": "Introducing commit af0903f in ash-project/ash_postgres", "tags": ["related"], "url": "https://github.com/ash-project/ash_postgres/commit/af0903f1380468bbe1b61fe65acb33772b5e24a5"}, {"name": "Fix commit 8aa8122 in ash-project/ash_postgres", "tags": ["patch"], "url": "https://github.com/ash-project/ash_postgres/commit/8aa81220c401cae412d21078d11b3519ea25d3a9"}], "source": {"discovery": "EXTERNAL"}, "title": "AshPostgres returns another tenant's record for a skipped upsert when return_skipped_upsert? is set"}}}

{}

{"affected": [{"affectedData": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.AshPostgres.DataLayer'"], "packageName": "ash_postgres", "packageURL": "pkg:hex/ash_postgres", "product": "ash_postgres", "programFiles": ["lib/data_layer.ex"], "programRoutines": [{"name": "'Elixir.AshPostgres.DataLayer':do_bulk_create/3"}, {"name": "'Elixir.AshPostgres.DataLayer':upsert/4"}, {"name": "'Elixir.AshPostgres.DataLayer':bulk_create/3"}], "repo": "https://github.com/ash-project/ash_postgres", "vendor": "ash-project", "versions": [{"lessThan": "2.15.2", "status": "affected", "version": "2.6.22", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.AshPostgres.DataLayer'"], "packageName": "ash-project/ash_postgres", "packageURL": "pkg:github/ash-project/ash_postgres", "product": "ash_postgres", "programFiles": ["lib/data_layer.ex"], "programRoutines": [{"name": "'Elixir.AshPostgres.DataLayer':do_bulk_create/3"}, {"name": "'Elixir.AshPostgres.DataLayer':upsert/4"}, {"name": "'Elixir.AshPostgres.DataLayer':bulk_create/3"}], "repo": "https://github.com/ash-project/ash_postgres", "vendor": "ash-project", "versions": [{"lessThan": "8aa81220c401cae412d21078d11b3519ea25d3a9", "status": "affected", "version": "af0903f1380468bbe1b61fe65acb33772b5e24a5", "versionType": "git"}]}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Incorrect Authorization vulnerability in ash-project ash_postgres allows a user to read another tenant's record through a skipped upsert.\n\nWhen Ash.bulk_create/4 or a single create runs as an upsert with return_skipped_upsert?: true and the upsert is skipped (for example because its upsert_condition does not hold), AshPostgres.DataLayer reads the existing row back by the upsert identity in do_bulk_create/3 and upsert/4. That lookup did not apply the resource's attribute multitenancy, so on a resource using strategy :attribute it could match and return the row of another tenant with the same identity values, exposing its fields to the caller.\n\nThis issue affects ash_postgres: from 2.6.22 before 2.15.2."}], "id": "CVE-2026-115635", "lastModified": "2026-10-25T20:16:32.293", "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"}]}, "published": "2026-10-25T20:16:32.293", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-115635.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/ash-project/ash/security/advisories/GHSA-36hg-wwp2-fg8w"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/ash-project/ash_postgres/commit/8aa81220c401cae412d21078d11b3519ea25d3a9"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/ash-project/ash_postgres/commit/af0903f1380468bbe1b61fe65acb33772b5e24a5"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-115635"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-863"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

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