Vulnerability · Published Aug 30, 2026 · Assigned by EEF

CVE-2026-81643Broken access control in AshGraphql subscription batcher applies authorization suppression to only the first notification

Low 2.3

In plain English

A low-severity incorrect authorization in ash_graphql from ash-project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).

Severity (CVSS 4.0)2.3Low

Exploit odds (30 days)0.4%top 62.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
ash-project	ash_graphql	1.4.0 – before 1.11.0
ash-project	ash_graphql	3cb2c9870d050c7c4bba6c211aaed97d732f7e81 – before e8e67f39add2ce0771e6db5f086afe68ba212c57

Weakness: CWE-863 · Vector: 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

References

https://github.com/ash-project/ash_graphql/security/advisories/GHSA-j684-hch4-q888 vendor-advisory, related
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/e8e67f39add2ce0771e6db5f086afe68ba212c57 patch