Low severity · published Aug 30, 2026
CVE-2026-81643
Broken access control in AshGraphql subscription batcher applies authorization suppression to only the first notification
2.3
CVSS
0.4%
EPSS
No
On KEV
Description
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
ash_graphql · ash-project
1.4.0 before 1.11.0; 3cb2c9870d050c7c4bba6c211aaed97d732f7e81 before e8e67f39add2ce0771e6db5f086afe68ba212c57 · source: vendor
Affected product
AS
ash_graphql
ash-project
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