CVE-2026-115635

Incorrect Authorization vulnerability in ash-project ash_postgres allows a user to read another tenant's record through a skipped upsert. When 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. This issue affects ash_postgres: from 2.6.22 before 2.15.2.

CVSS

No CVSS.

References

Link	Resource
https://cna.erlef.org/cves/CVE-2026-115635.html
https://github.com/ash-project/ash/security/advisories/GHSA-36hg-wwp2-fg8w
https://github.com/ash-project/ash_postgres/commit/8aa81220c401cae412d21078d11b3519ea25d3a9
https://github.com/ash-project/ash_postgres/commit/af0903f1380468bbe1b61fe65acb33772b5e24a5
https://osv.dev/vulnerability/EEF-CVE-2026-115635

Configurations

No configuration.

History

25 Oct 2026, 20:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-25 20:16

Updated : 2026-10-26 15:16

NVD link : CVE-2026-115635

Mitre link : CVE-2026-115635

CVE.ORG link : CVE-2026-115635

JSON object : View

Products Affected

No product.

CWE

CWE-863

Incorrect Authorization

{"id": "CVE-2026-115635", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-115635", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-26T14:29:19.217057Z"}}], "cvssMetricV40": [{"type": "Secondary", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.0, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "affectedData": [{"cpes": ["cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:*"], "repo": "https://github.com/ash-project/ash_postgres", "vendor": "ash-project", "modules": ["'Elixir.AshPostgres.DataLayer'"], "product": "ash_postgres", "versions": [{"status": "affected", "version": "2.6.22", "lessThan": "2.15.2", "versionType": "semver"}], "packageURL": "pkg:hex/ash_postgres", "packageName": "ash_postgres", "programFiles": ["lib/data_layer.ex"], "collectionURL": "https://repo.hex.pm", "defaultStatus": "unaffected", "programRoutines": [{"name": "'Elixir.AshPostgres.DataLayer':do_bulk_create/3"}, {"name": "'Elixir.AshPostgres.DataLayer':upsert/4"}, {"name": "'Elixir.AshPostgres.DataLayer':bulk_create/3"}]}, {"cpes": ["cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:*"], "repo": "https://github.com/ash-project/ash_postgres", "vendor": "ash-project", "modules": ["'Elixir.AshPostgres.DataLayer'"], "product": "ash_postgres", "versions": [{"status": "affected", "version": "af0903f1380468bbe1b61fe65acb33772b5e24a5", "lessThan": "8aa81220c401cae412d21078d11b3519ea25d3a9", "versionType": "git"}], "packageURL": "pkg:github/ash-project/ash_postgres", "packageName": "ash-project/ash_postgres", "programFiles": ["lib/data_layer.ex"], "collectionURL": "https://github.com", "defaultStatus": "unaffected", "programRoutines": [{"name": "'Elixir.AshPostgres.DataLayer':do_bulk_create/3"}, {"name": "'Elixir.AshPostgres.DataLayer':upsert/4"}, {"name": "'Elixir.AshPostgres.DataLayer':bulk_create/3"}]}]}], "published": "2026-10-25T20:16:32.293", "references": [{"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", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "description": [{"lang": "en", "value": "CWE-863"}]}], "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."}], "lastModified": "2026-10-26T15:16:39.303", "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}