{"id":"EEF-CVE-2026-78216","summary":"AshLua eval read operations can read field-policy-protected fields via aggregates","details":"## Summary\n\nAshLua exposes Ash read actions to Lua scripts run through an `eval` action. A read call accepts an `operation` (`list`, `min`, `max`, `first`, `sum`, `avg`) that builds an ad-hoc `Ash.Query.Aggregate` over a named field and returns its raw value.\n\nAsh field policies redact forbidden fields on returned records (replacing them with `%Ash.ForbiddenField{}`), but that redaction does not apply to aggregate values. A script could therefore read a field the calling actor's field policies forbid by requesting it as an aggregate instead of as a field. This includes fields that are `public? true` but restricted per-actor by a field policy, such as sensitive PII. The prior hardening only enforced the exposed-field allow-list (field visibility), which is a separate axis from per-actor field-policy authorization.\n\nThe fix authorizes the aggregated field against the resource's field policies, so aggregating over a field the actor may not see is refused or scoped to the rows where it is visible.\n\nThis issue affects ash_lua: from 0.1.0 before 0.2.2.\n\n## Configurations\n\nReachable only when an application exposes an AshLua `eval` action over a resource whose field policies restrict a field that the calling actor can still name as an operation aggregate (for example a `public? true` but field-policy-protected attribute).","aliases":["CVE-2026-78216","GHSA-5whv-8rcp-x33j"],"modified":"2026-09-08T16:56:02.903287963Z","published":"2026-09-08T16:42:20.908Z","database_specific":{"cwe_ids":["CWE-1220"],"capec_ids":["CAPEC-1"],"cpe_ids":["cpe:2.3:a:ash-project:ash_lua:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"https://github.com/ash-project/ash_lua/security/advisories/GHSA-5whv-8rcp-x33j"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-78216.html"},{"type":"WEB","url":"https://github.com/ash-project/ash_lua/commit/8675e47cca81f36594083a7e63379bac9e123e72"},{"type":"FIX","url":"https://github.com/ash-project/ash_lua/commit/266a5dcc56d5015b6d316c10606169e753b07450"},{"type":"PACKAGE","url":"https://hex.pm/packages/ash_lua"}],"affected":[{"package":{"name":"ash_lua","ecosystem":"Hex","purl":"pkg:hex/ash_lua"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.1.0"},{"fixed":"0.2.2"}]}],"versions":["0.1.0","0.1.1","0.1.2","0.1.3","0.1.4","0.1.5","0.1.6","0.2.0","0.2.1"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-78216.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/ash-project/ash_lua","events":[{"introduced":"8675e47cca81f36594083a7e63379bac9e123e72"},{"fixed":"266a5dcc56d5015b6d316c10606169e753b07450"}]}],"versions":["v0.2.1","v0.2.0","v0.1.6","v0.1.5","v0.1.4","v0.1.3","v0.1.2","v0.1.1","v0.1.0"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-78216.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}],"credits":[{"name":"Zach Daniel / Ash Project","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"COORDINATOR"},{"name":"Aaron Hong / Remedy","type":"FINDER"}]}