{"id":"CVE-2026-81643","aliases":["EEF-CVE-2026-81643","EUVD-2026-68284","GHSA-j684-hch4-q888"],"status":"published","title":"Broken access control in AshGraphql subscription batcher applies authorization suppression to only the first notification","description":"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.","severity":{"version":"4.0","score":2.3,"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","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00427,"percentile":0.37467,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-863"],"published":"2026-08-30T18:20:35Z","modified":"2026-10-28T02:31:13Z","fixes":[{"ecosystem":"Hex","package":"ash_graphql","fixed_in":["1.11.0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Hex","package":"ash_graphql","ranges":[{"type":"SEMVER","events":[{"introduced":"1.4.0"},{"fixed":"1.11.0"}]}],"versions":["1.10.0","1.10.1","1.4.0","1.4.1","1.4.2","1.4.3","1.4.4","1.4.5","1.4.6","1.4.7","1.5.0","1.5.1","1.6.0","1.7.0","1.7.1","1.7.10","1.7.11","1.7.12","1.7.13","1.7.14","1.7.15","1.7.16","1.7.17","1.7.2","1.7.3","1.7.4","1.7.5","1.7.6","1.7.7","1.7.8","1.7.9","1.8.0","1.8.1","1.8.2","1.8.3","1.8.4","1.8.5","1.9.0","1.9.1","1.9.2","1.9.3","1.9.4"]}],"products":[{"vendor":"ash-project","product":"ash_graphql"}],"references":[{"url":"https://github.com/ash-project/ash_graphql/security/advisories/GHSA-j684-hch4-q888","tags":["vendor-advisory","related","exploit","advisory"]},{"url":"https://cna.erlef.org/cves/CVE-2026-81643.html","tags":["related","web"]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-81643","tags":["related","web"]},{"url":"https://github.com/ash-project/ash_graphql/commit/e8e67f39add2ce0771e6db5f086afe68ba212c57","tags":["patch","fix"]},{"url":"https://github.com","tags":["web"]},{"url":"https://repo.hex.pm","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81643.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81643","tags":["advisory"]},{"url":"https://github.com/ash-project/ash_graphql","tags":["package"]},{"url":"https://hex.pm/packages/ash_graphql","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-81643","title":"Broken access control in AshGraphql subscription batcher applies authorization suppression to only the first notification","description":"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.","status":"published","published":"2026-08-30T18:20:35.564Z","modified":"2026-08-31T15:01:05.884Z","cvss":[{"version":"4.0","score":2.3,"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","level":"low","assessor":"cna"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T13:36:29.327819Z"}],"euvd":[{"id":"EUVD-2026-68284","description":"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.","status":"published","published":"2026-08-30T18:20:35Z","modified":"2026-08-31T15:01:05Z","cvss":[{"version":"4.0","score":2.3,"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","level":"low"}],"updated_at":"2026-11-02T18:01:21.100116Z"}],"nvd":[{"id":"CVE-2026-81643","description":"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.","status":"published","published":"2026-08-30T19:17:29.707Z","modified":"2026-09-01T21:15:00.147Z","cvss":[{"version":"4.0","score":2.3,"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/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","level":"low","assessor":"secondary"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:12:42.691315Z"}],"osv":[{"id":"CVE-2026-81643","title":"Broken access control in AshGraphql subscription batcher applies authorization suppression to only the first notification","description":"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.","status":"published","published":"2026-08-30T18:20:35.564Z","modified":"2026-10-28T02:31:13.643351418Z","cvss":[{"version":"4.0","score":2.3,"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","level":"low"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T15:45:18.131258Z"},{"id":"EEF-CVE-2026-81643","title":"Broken access control in AshGraphql subscription batcher applies authorization suppression to only the first notification","description":"## Summary\n\nIncorrect 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.\n\n## Configurations\n\nThe application exposes `ash_graphql` subscriptions with Ash authorization enabled, and two or more notifications are batched together within the batch interval (the default path).","status":"published","published":"2026-08-30T18:20:35.564Z","modified":"2026-09-08T20:30:03.502519887Z","cvss":[{"version":"4.0","score":2.3,"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","level":"low"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T15:46:33.520522Z"}]}}