Vulnerability-Lookup

CVE-2026-81318 (GCVE-0-2026-81318)

Vulnerability from cvelistv5 – Published: 2026-08-30 11:56 – Updated: 2026-08-30 11:56

Title

Distinct-query aggregate drops the tenant schema prefix, leaking across tenants in AshSql

Summary

Incorrect Authorization vulnerability in ash-project ash_sql allows a caller in a schema-based multitenant application to receive aggregate values computed from another tenant's rows. When an aggregate is computed over a distinct query, AshSql.AggregateQuery.add_single_aggs/5 rebuilds the outer query from query.from.source alone, which is only the {table, schema} tuple and does not carry query.prefix or query.from.prefix. For strategy(:context) multitenancy those hold the tenant schema, so the rebuilt outer query reads the repo's default schema while the inner correlated subquery still reads the tenant schema, and the two are joined only on primary key. The aggregate, and any relationship join added off the prefix-less binding, is then computed against the wrong tenant's rows. The neighbouring limit and exists branches instead wrap the query with subquery/1, which preserves the prefix. This issue affects ash_sql: from 0.1.0 before 0.7.1.

Severity

2.1 (Low)


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

CWE

CWE-863 - Incorrect Authorization

Assigner

EEF mitre root

References

4 references

URL	Tags
https://github.com/ash-project/ash_sql/security/a…	vendor-advisoryrelated
https://cna.erlef.org/cves/CVE-2026-81318.html	related
https://osv.dev/vulnerability/EEF-CVE-2026-81318	related
https://github.com/ash-project/ash_sql/commit/3d9…	patch

Impacted products

2 products

Vendor	Product	Version	CPE status
ash-project	ash_sql	Affected: 0.1.0 , < 0.7.1 (semver) cpe:2.3:a:ash-project:ash_sql::::::::
ash-project	ash_sql	Affected: dd092ed273dec7bd2194352f24a39229fc8ae68b , < 3d95478cc9e1d5bfaf6144fe9b9793f29e5ab889 (git) cpe:2.3:a:ash-project:ash_sql::::::::

Credits

Peter Ullrich Peter Ullrich Zach Daniel / Ash Project Jonatan Männchen / EEF

Show details on NVD website

JSON

To clipboard

{
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        {
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            "cpe:2.3:a:ash-project:ash_sql:*:*:*:*:*:*:*:*"
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          "modules": [
            "\u0027Elixir.AshSql.AggregateQuery\u0027"
          ],
          "packageName": "ash_sql",
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          "product": "ash_sql",
          "programFiles": [
            "lib/aggregate_query.ex"
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              "value": "\u003cp\u003eIncorrect Authorization vulnerability in ash-project ash_sql allows a caller in a schema-based multitenant application to receive aggregate values computed from another tenant\u0027s rows.\u003c/p\u003e\n\u003cp\u003eWhen an aggregate is computed over a \u003ccode\u003edistinct\u003c/code\u003e query, \u003ccode\u003eAshSql.AggregateQuery.add_single_aggs/5\u003c/code\u003e rebuilds the outer query from \u003ccode\u003equery.from.source\u003c/code\u003e alone, which is only the \u003ccode\u003e{table, schema}\u003c/code\u003e tuple and does not carry \u003ccode\u003equery.prefix\u003c/code\u003e or \u003ccode\u003equery.from.prefix\u003c/code\u003e. For \u003ccode\u003estrategy(:context)\u003c/code\u003e multitenancy those hold the tenant schema, so the rebuilt outer query reads the repo\u0027s default schema while the inner correlated subquery still reads the tenant schema, and the two are joined only on primary key. The aggregate, and any relationship join added off the prefix-less binding, is then computed against the wrong tenant\u0027s rows. The neighbouring limit and exists branches instead wrap the query with \u003ccode\u003esubquery/1\u003c/code\u003e, which preserves the prefix.\u003c/p\u003e\n\u003cp\u003eThis issue affects ash_sql: from 0.1.0 before 0.7.1.\u003c/p\u003e"
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      "source": {
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      "title": "Distinct-query aggregate drops the tenant schema prefix, leaking across tenants in AshSql"
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The aggregate, and any relationship join added off the prefix-less binding, is then computed against the wrong tenant\u0027s rows. 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  }
}

FKIE_CVE-2026-81318

Vulnerability from fkie_nvd - Published: 2026-08-30 12:17 - Updated: 2026-08-30 12:17

Severity

2.1 (Low) - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/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-2026-81318.html
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/ash-project/ash_sql/commit/3d95478cc9e1d5bfaf6144fe9b9793f29e5ab889
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/ash-project/ash_sql/security/advisories/GHSA-ww8j-58rc-f8h3
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://osv.dev/vulnerability/EEF-CVE-2026-81318

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    {
      "affectedData": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:ash-project:ash_sql:*:*:*:*:*:*:*:*"
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          "modules": [
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          "vendor": "ash-project",
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              "versionType": "semver"
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          ],
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    }
  ],
  "id": "CVE-2026-81318",
  "lastModified": "2026-08-30T12:17:19.030",
  "metrics": {
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          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/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": "LOW",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-30T12:17:19.030",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://cna.erlef.org/cves/CVE-2026-81318.html"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/ash-project/ash_sql/commit/3d95478cc9e1d5bfaf6144fe9b9793f29e5ab889"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/ash-project/ash_sql/security/advisories/GHSA-ww8j-58rc-f8h3"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-81318"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}

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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

CVE-2026-81318 (GCVE-0-2026-81318)

FKIE_CVE-2026-81318

Tags

Sightings

Nomenclature