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

Vulnerability from cvelistv5 – Published: 2026-08-30 18:20 – Updated: 2026-08-31 15:01
VLAI
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
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 15:00 UTC
CWE
  • CWE-863 - Incorrect Authorization
Assigner
References
Impacted 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:*:*:*:*:*:*:*:*
Create a notification for this product.
ash-project ash_graphql Affected: 3cb2c9870d050c7c4bba6c211aaed97d732f7e81 , < e8e67f39add2ce0771e6db5f086afe68ba212c57 (git)
    cpe:2.3:a:ash-project:ash_graphql:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Peter Ullrich Peter Ullrich Zach Daniel / Ash Project Jonatan Männchen / EEF
Show details on NVD website
To clipboard 

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The fix applies `should_send?/1` to the whole batch.\\n\\nThis issue affects ash_graphql: from 1.4.0 before 1.11.0.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-863\", \"description\": \"CWE-863 Incorrect Authorization\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"The application exposes ash_graphql subscriptions with Ash authorization enabled, and two or more notifications are batched together within the batch interval (the default path).\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThe application exposes \u003ccode\u003eash_graphql\u003c/code\u003e subscriptions with Ash authorization enabled, and two or more notifications are batched together within the batch interval (the default path).\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"The application exposes `ash_graphql` subscriptions with Ash authorization enabled, and two or more notifications are batched together within the batch interval (the default path).\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:ash-project:ash_graphql:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.11.0\", \"versionStartIncluding\": \"1.4.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-08-30T18:20:35.564Z\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-81643\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-31T15:00:43.822398Z\"}}}], \"references\": [{\"url\": \"https://github.com/ash-project/ash_graphql/security/advisories/GHSA-j684-hch4-q888\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2026-08-31T15:00:59.386Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-81643\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-30T18:20:35.564Z\", \"dateReserved\": \"2026-08-30T04:45:01.564Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-08-30T18:20:35.564Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.