CVE-2026-115635 (GCVE-0-2026-115635)
Vulnerability from cvelistv5 – Published: 2026-10-25 19:48 – Updated: 2026-10-26 14:35
VLAI
EPSS
VEX
Title
AshPostgres returns another tenant's record for a skipped upsert when return_skipped_upsert? is set
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-26 14:29 UTC
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/ash-project/ash/security/advis… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-115635.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-115635 | related |
| https://github.com/ash-project/ash_postgres/commi… | related |
| https://github.com/ash-project/ash_postgres/commi… | patch |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| ash-project | ash_postgres |
Affected:
2.6.22 , < 2.15.2
(semver)
cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:* |
||
| ash-project | ash_postgres |
Affected:
af0903f1380468bbe1b61fe65acb33772b5e24a5 , < 8aa81220c401cae412d21078d11b3519ea25d3a9
(git)
cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:* |
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"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": "\u003cp\u003eReachable when a resource uses attribute multitenancy, an action performs upserts with \u003ccode\u003ereturn_skipped_upsert?: true\u003c/code\u003e, and a caller can supply identity values that another tenant also uses.\u003c/p\u003e"
},
{
"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": "\u003cp\u003eIncorrect Authorization vulnerability in ash-project ash_postgres allows a user to read another tenant\u0027s record through a skipped upsert.\u003c/p\u003e\n\u003cp\u003eWhen \u003ccode\u003eAsh.bulk_create/4\u003c/code\u003e or a single create runs as an upsert with \u003ccode\u003ereturn_skipped_upsert?: true\u003c/code\u003e and the upsert is skipped (for example because its \u003ccode\u003eupsert_condition\u003c/code\u003e does not hold), \u003ccode\u003eAshPostgres.DataLayer\u003c/code\u003e reads the existing row back by the upsert identity in \u003ccode\u003edo_bulk_create/3\u003c/code\u003e and \u003ccode\u003eupsert/4\u003c/code\u003e. That lookup did not apply the resource\u0027s attribute multitenancy, so on a resource using \u003ccode\u003estrategy :attribute\u003c/code\u003e it could match and return the row of another tenant with the same identity values, exposing its fields to the caller.\u003c/p\u003e\n\u003cp\u003eThis issue affects ash_postgres: from 2.6.22 before 2.15.2.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Incorrect Authorization vulnerability in ash-project ash_postgres allows a user to read another tenant\u0027s 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\u0027s 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\u0027s 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\u0027s 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": [
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"base64": false,
"type": "text/html",
"value": "\u003cp\u003eA user of one tenant whose upsert is skipped receives another tenant\u0027s record with the same identity values.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "A user of one tenant whose upsert is skipped receives another tenant\u0027s record with the same identity values."
}
],
"value": "A user of one tenant whose upsert is skipped receives another tenant\u0027s 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": {
"dateUpdated": "2026-10-25T19:48:43.829Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"name": "`Ash.bulk_create` with `return_skipped_upsert?: true` in AshPostgres returns another tenant\u0027s 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\u0027s record for a skipped upsert when return_skipped_upsert? is set"
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-115635",
"datePublished": "2026-10-25T19:48:43.829Z",
"dateReserved": "2026-10-23T13:00:02.145Z",
"dateUpdated": "2026-10-26T14:35:21.261Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.