ash-project ash_graphql up to 1.10.x Subscription Batcher AshGraphql.Subscription.Batcher.do_send improper authorization

Summaryinfo

A vulnerability was found in ash-project ash_graphql up to 1.10.x and classified as problematic. Affected is the function AshGraphql.Subscription.Batcher.do_send of the component Subscription Batcher. Executing a manipulation can lead to improper authorization. This vulnerability appears as CVE-2026-81643. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic was found in ash-project ash_graphql up to 1.10.x. This vulnerability affects the function AshGraphql.Subscription.Batcher.do_send of the component Subscription Batcher. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-81643 since 08/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

Upgrading to version 1.11.0 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• ash-project

Name

• ash_graphql

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10

Website

• Product: https://github.com/ash-project/ash_graphql/

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