Vulnerability-Lookup

CVE-2026-81643 (GCVE-0-2026-81643)

Vulnerability from cvelistv5 – Published: 2026-08-30 18:20 – Updated: 2026-08-30 18:20

Title

Broken access control in AshGraphql subscription batcher applies authorization suppression to only the first notification

Summary

Incorrect Authorization vulnerability in ash-project ash_graphql delivers GraphQL subscription payloads for records a subscriber is not authorized to see. In AshGraphql.Subscription.Batcher, do_send/5 resolves the first notification of a batch and filters it with should_send?/1, which drops results whose errors are coded forbidden or not_found or carry no code, precisely so that unauthorized results are not disclosed. The remaining notifications in the batch are read from the process dictionary, re-run through the pipeline, and appended to the outgoing results without that filter. They reach pubsub.publish_subscription/2, and the not is_nil(record) guard drops only nil records, not error-carrying results. Any two qualifying notifications arriving within the default one-second batch interval suffice, and batching is the default path. The fix applies should_send?/1 to the whole batch. This issue affects ash_graphql: from 1.4.0 before 1.11.0.

Severity

2.3 (Low)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:L/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_graphql/securi…	vendor-advisoryrelated
https://cna.erlef.org/cves/CVE-2026-81643.html	related
https://osv.dev/vulnerability/EEF-CVE-2026-81643	related
https://github.com/ash-project/ash_graphql/commit…	patch

Impacted products

2 products

Vendor	Product	Version	CPE status
ash-project	ash_graphql	Affected: 1.4.0 , < 1.11.0 (semver) cpe:2.3:a:ash-project:ash_graphql::::::::
ash-project	ash_graphql	Affected: 3cb2c9870d050c7c4bba6c211aaed97d732f7e81 , < e8e67f39add2ce0771e6db5f086afe68ba212c57 (git) cpe:2.3:a:ash-project:ash_graphql::::::::

Credits

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

Show details on NVD website

JSON

To clipboard

{
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      "affected": [
        {
          "collectionURL": "https://repo.hex.pm",
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            "cpe:2.3:a:ash-project:ash_graphql:*:*:*:*:*:*:*:*"
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          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.AshGraphql.Subscription.Batcher\u0027"
          ],
          "packageName": "ash_graphql",
          "packageURL": "pkg:hex/ash_graphql",
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            "lib/subscription/batcher.ex"
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      "title": "Broken access control in AshGraphql subscription batcher applies authorization suppression to only the first notification"
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They reach pubsub.publish_subscription/2, and the not is_nil(record) guard drops only nil records, not error-carrying results. Any two qualifying notifications arriving within the default one-second batch interval suffice, and batching is the default path. 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  }
}

FKIE_CVE-2026-81643

Vulnerability from fkie_nvd - Published: 2026-08-30 19:17 - Updated: 2026-08-30 19:17

Severity

2.3 (Low) - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/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-2026-81643.html
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/ash-project/ash_graphql/commit/e8e67f39add2ce0771e6db5f086afe68ba212c57
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/ash-project/ash_graphql/security/advisories/GHSA-j684-hch4-q888
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://osv.dev/vulnerability/EEF-CVE-2026-81643

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:ash-project:ash_graphql:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.AshGraphql.Subscription.Batcher\u0027"
          ],
          "packageName": "ash_graphql",
          "packageURL": "pkg:hex/ash_graphql",
          "product": "ash_graphql",
          "programFiles": [
            "lib/subscription/batcher.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.AshGraphql.Subscription.Batcher\u0027:do_send/5"
            }
          ],
          "repo": "https://github.com/ash-project/ash_graphql",
          "vendor": "ash-project",
          "versions": [
            {
              "lessThan": "1.11.0",
              "status": "affected",
              "version": "1.4.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:ash-project:ash_graphql:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.AshGraphql.Subscription.Batcher\u0027"
          ],
          "packageName": "ash-project/ash_graphql",
          "packageURL": "pkg:github/ash-project/ash_graphql",
          "product": "ash_graphql",
          "programFiles": [
            "lib/subscription/batcher.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.AshGraphql.Subscription.Batcher\u0027:do_send/5"
            }
          ],
          "repo": "https://github.com/ash-project/ash_graphql",
          "vendor": "ash-project",
          "versions": [
            {
              "lessThan": "e8e67f39add2ce0771e6db5f086afe68ba212c57",
              "status": "affected",
              "version": "3cb2c9870d050c7c4bba6c211aaed97d732f7e81",
              "versionType": "git"
            }
          ]
        }
      ],
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  "descriptions": [
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      "value": "Incorrect Authorization vulnerability in ash-project ash_graphql delivers GraphQL subscription payloads for records a subscriber is not authorized to see.\n\nIn AshGraphql.Subscription.Batcher, do_send/5 resolves the first notification of a batch and filters it with should_send?/1, which drops results whose errors are coded forbidden or not_found or carry no code, precisely so that unauthorized results are not disclosed. The remaining notifications in the batch are read from the process dictionary, re-run through the pipeline, and appended to the outgoing results without that filter. They reach pubsub.publish_subscription/2, and the not is_nil(record) guard drops only nil records, not error-carrying results. Any two qualifying notifications arriving within the default one-second batch interval suffice, and batching is the default path. The fix applies should_send?/1 to the whole batch.\n\nThis issue affects ash_graphql: from 1.4.0 before 1.11.0."
    }
  ],
  "id": "CVE-2026-81643",
  "lastModified": "2026-08-30T19:17:29.707",
  "metrics": {
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      {
        "cvssData": {
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          "Recovery": "NOT_DEFINED",
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          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 2.3,
          "baseSeverity": "LOW",
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          "exploitMaturity": "NOT_DEFINED",
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          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
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          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/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": "2026-08-30T19:17:29.707",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://cna.erlef.org/cves/CVE-2026-81643.html"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/ash-project/ash_graphql/commit/e8e67f39add2ce0771e6db5f086afe68ba212c57"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/ash-project/ash_graphql/security/advisories/GHSA-j684-hch4-q888"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-81643"
    }
  ],
  "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-2026-81643 (GCVE-0-2026-81643)

FKIE_CVE-2026-81643

Tags

Sightings

Nomenclature