{"id":"EEF-CVE-2026-93477","summary":"Private action arguments can be set by user input on the bulk destroy and bulk update paths in Ash","details":"## Summary\n\nImproperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in ash-project ash allows a user to set the value of a private action argument on the bulk destroy and bulk update paths.\n\nAction arguments declared with `public?: false` are meant to be set only by trusted server-side code (for example via `Ash.Changeset.set_private_argument/3`) and must not be settable from end-user input. CVE-2026-55736 fixed the non-bulk changeset path to strip private arguments from user-supplied parameter maps, but the bulk destroy and bulk update paths were not covered.\n\n`Ash.Actions.Destroy.Bulk.base_changeset/5` and `Ash.Actions.Update.Bulk.base_changeset/5` match every key in the caller-supplied parameter map against all of the action's arguments with no `public?` check, then apply the matches to the base changeset. A caller who can submit parameters to a bulk destroy or bulk update action (for example through AshJsonApi, AshGraphql, or a controller that forwards request parameters to `Ash.bulk_destroy/4` or `Ash.bulk_update/4`) can therefore set any private argument of that action, including one referenced by an `arg(...)` template in the action's changes or validations. Depending on how the application uses the argument (for example an `acting_user_id` driving authorization or record ownership, or audit metadata), this can lead to an integrity violation or privilege escalation.\n\nThe fix requires `public?` in the argument matching on both bulk paths; private arguments remain settable server-side via the `:private_arguments` option.\n\nThis issue affects ash: from 2.17.15 before 3.33.11.\n\n## Configurations\n\nAn action must declare a private argument (`public?: false`) that is referenced by an `arg(...)` template in one of its changes or validations, be invocable as a bulk destroy or bulk update, and the application must pass untrusted user-supplied parameters into `Ash.bulk_destroy/4` or `Ash.bulk_update/4` (directly or through AshJsonApi/AshGraphql).","aliases":["CVE-2026-93477","GHSA-c2p4-p7q6-hr2j"],"modified":"2026-09-25T07:25:59.386152477Z","published":"2026-09-25T07:08:55.191Z","database_specific":{"cwe_ids":["CWE-915"],"capec_ids":["CAPEC-77"],"cpe_ids":["cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"https://github.com/ash-project/ash/security/advisories/GHSA-c2p4-p7q6-hr2j"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-93477.html"},{"type":"WEB","url":"https://github.com/ash-project/ash/commit/8c17434803b2e91de522bdfbd0ca918e5d5898df"},{"type":"FIX","url":"https://github.com/ash-project/ash/commit/6b7ac53a0a2532291eb940d7beaf0fbb2da6fc4f"},{"type":"PACKAGE","url":"https://hex.pm/packages/ash"}],"affected":[{"package":{"name":"ash","ecosystem":"Hex","purl":"pkg:hex/ash"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2.17.15"},{"fixed":"3.33.11"}]}],"versions":["2.17.15","2.17.16","2.17.17","2.17.18","2.17.19","2.17.20","2.17.21","2.17.22","2.17.23","2.17.24","2.18.0","2.18.1","2.18.2","2.19.0","2.19.1","2.19.10","2.19.11","2.19.12","2.19.13","2.19.14","2.19.2","2.19.3","2.19.4","2.19.5","2.19.6","2.19.7","2.19.8","2.19.9","2.20.0","2.20.1","2.20.2","2.20.3","2.21.0","2.21.1","2.21.10","2.21.11","2.21.12","2.21.13","2.21.14","2.21.15","2.21.2","2.21.3","2.21.4","2.21.5","2.21.6","2.21.7","2.21.8","2.21.9","3.0.0","3.0.0-rc.0","3.0.0-rc.1","3.0.0-rc.10","3.0.0-rc.11","3.0.0-rc.12","3.0.0-rc.13","3.0.0-rc.14","3.0.0-rc.15","3.0.0-rc.16","3.0.0-rc.17","3.0.0-rc.18","3.0.0-rc.19","3.0.0-rc.20","3.0.0-rc.21","3.0.0-rc.22","3.0.0-rc.23","3.0.0-rc.24","3.0.0-rc.25","3.0.0-rc.26","3.0.0-rc.27","3.0.0-rc.28","3.0.0-rc.29","3.0.0-rc.3","3.0.0-rc.31","3.0.0-rc.32","3.0.0-rc.33","3.0.0-rc.34","3.0.0-rc.35","3.0.0-rc.36","3.0.0-rc.37","3.0.0-rc.38","3.0.0-rc.39","3.0.0-rc.4","3.0.0-rc.40","3.0.0-rc.41","3.0.0-rc.42","3.0.0-rc.43","3.0.0-rc.44","3.0.0-rc.45","3.0.0-rc.46","3.0.0-rc.5","3.0.0-rc.6","3.0.0-rc.7","3.0.0-rc.8","3.0.0-rc.9","3.0.1","3.0.10","3.0.11","3.0.12","3.0.13","3.0.14","3.0.15","3.0.16","3.0.2","3.0.3","3.0.4","3.0.5","3.0.6","3.0.7","3.0.8","3.0.9","3.1.0","3.1.1","3.1.2","3.1.3","3.1.4","3.1.5","3.1.6","3.1.7","3.1.8","3.10.0","3.10.1","3.11.0","3.11.1","3.11.2","3.11.3","3.12.0","3.13.0","3.13.1","3.13.2","3.14.0","3.14.1","3.15.0","3.16.0","3.17.0","3.17.1","3.18.0","3.19.0","3.19.1","3.19.2","3.19.3","3.2.0","3.2.1","3.2.2","3.2.3","3.2.4","3.2.5","3.2.6","3.20.0","3.21.0","3.21.1","3.21.2","3.21.3","3.22.0","3.22.1","3.22.2","3.23.0","3.23.1","3.24.0","3.24.1","3.24.2","3.24.3","3.24.4","3.24.5","3.24.6","3.24.7","3.25.0","3.25.1","3.25.2","3.26.0","3.27.0","3.27.1","3.27.2","3.27.3","3.27.4","3.27.5","3.27.6","3.27.7","3.27.8","3.28.0","3.29.0","3.29.1","3.29.2","3.29.3","3.3.0","3.3.1","3.3.2","3.3.3","3.30.0","3.30.1","3.31.0","3.31.1","3.31.2","3.31.3","3.32.0","3.32.1","3.32.2","3.32.3","3.33.0","3.33.1","3.33.10","3.33.2","3.33.3","3.33.4","3.33.5","3.33.6","3.33.7","3.33.8","3.33.9","3.4.0","3.4.1","3.4.10","3.4.11","3.4.12","3.4.13","3.4.14","3.4.15","3.4.16","3.4.17","3.4.18","3.4.19","3.4.2","3.4.20","3.4.21","3.4.22","3.4.23","3.4.24","3.4.25","3.4.26","3.4.27","3.4.28","3.4.29","3.4.3","3.4.30","3.4.31","3.4.32","3.4.33","3.4.34","3.4.35","3.4.36","3.4.37","3.4.38","3.4.39","3.4.4","3.4.40","3.4.41","3.4.42","3.4.43","3.4.44","3.4.45","3.4.46","3.4.47","3.4.48","3.4.49","3.4.5","3.4.50","3.4.51","3.4.52","3.4.53","3.4.54","3.4.55","3.4.56","3.4.57","3.4.58","3.4.59","3.4.6","3.4.60","3.4.61","3.4.62","3.4.63","3.4.64","3.4.65","3.4.66","3.4.67","3.4.68","3.4.69","3.4.7","3.4.70","3.4.71","3.4.72","3.4.73","3.4.74","3.4.8","3.4.9","3.5.0","3.5.1","3.5.10","3.5.11","3.5.12","3.5.13","3.5.14","3.5.15","3.5.16","3.5.17","3.5.18","3.5.19","3.5.2","3.5.20","3.5.21","3.5.22","3.5.23","3.5.24","3.5.25","3.5.26","3.5.27","3.5.28","3.5.29","3.5.3","3.5.30","3.5.31","3.5.32","3.5.33","3.5.34","3.5.35","3.5.36","3.5.37","3.5.38","3.5.39","3.5.4","3.5.40","3.5.41","3.5.42","3.5.43","3.5.5","3.5.6","3.5.7","3.5.8","3.5.9","3.6.0","3.6.1","3.6.2","3.6.3","3.7.0","3.7.1","3.7.2","3.7.3","3.7.4","3.7.5","3.7.6","3.8.0","3.9.0"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-93477.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/ash-project/ash","events":[{"introduced":"8c17434803b2e91de522bdfbd0ca918e5d5898df"},{"fixed":"6b7ac53a0a2532291eb940d7beaf0fbb2da6fc4f"}]}],"versions":["v3.33.10","v3.33.9","v3.33.7","v3.33.6","v3.33.5","v3.33.4","v3.33.3","v3.33.2","v3.33.1","v3.32.3","v3.32.2","v3.32.1","v3.31.3","v3.31.2","v3.31.1","v3.31.0","v3.30.1","v3.30.0","v3.29.3","v3.29.2","v3.29.1","v3.29.0","v3.28.0","v3.27.8","v3.27.7","v3.27.6","v3.27.4","v3.27.3","v3.27.2","v3.27.1","v3.27.0","v3.26.0","v3.25.2","v3.25.1","v3.25.0","v3.24.7","v3.24.6","v3.24.5","v3.24.4","v3.24.3","v3.24.2","v3.24.1","v3.24.0","v3.23.1","v3.23.0","v3.22.2","v3.22.1","v3.22.0","v3.21.3","v3.21.2","v3.21.1","v3.21.0","v3.20.0","v3.19.3","v3.19.2","v3.19.1","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Daniel / Ash Project","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"COORDINATOR"}]}