AshTypescript.TypedController.RequestHandler in lib/ash_typescript/typed_controller/request_handler.ex calls Ash.Type.cast_input/3 and treats an {:ok, cast} result as fully validated. In Ash these are separate steps: cast_input/3 only coerces the term, while every constraint declared on the argument is applied by Ash.Type.apply_constraints/3, which this path never calls. Constraints such as one_of, max_length, min and max, and match are therefore inert, so a value outside a declared allowlist is accepted and passed to the route handler. Codegen renders the same constraints into the generated TypeScript types, so an allowlist appears enforced to a TypeScript caller while any other HTTP client ignores it. Empty-string to nil normalization also lives in apply_constraints, so the allow_nil?: false check accepts "" for a required argument.
Where a constraint gates a role, a status, or a sort direction, this becomes a privilege or state-machine bypass.
This issue affects ash_typescript: from 0.15.0 before 0.18.0.
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Tue, 01 Sep 2026 02:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Improper Input Validation vulnerability in ash-project ash_typescript allows a remote attacker to submit argument values outside a declared allowlist or bound on typed-controller routes. AshTypescript.TypedController.RequestHandler in lib/ash_typescript/typed_controller/request_handler.ex calls Ash.Type.cast_input/3 and treats an {:ok, cast} result as fully validated. In Ash these are separate steps: cast_input/3 only coerces the term, while every constraint declared on the argument is applied by Ash.Type.apply_constraints/3, which this path never calls. Constraints such as one_of, max_length, min and max, and match are therefore inert, so a value outside a declared allowlist is accepted and passed to the route handler. Codegen renders the same constraints into the generated TypeScript types, so an allowlist appears enforced to a TypeScript caller while any other HTTP client ignores it. Empty-string to nil normalization also lives in apply_constraints, so the allow_nil?: false check accepts "" for a required argument. Where a constraint gates a role, a status, or a sort direction, this becomes a privilege or state-machine bypass. This issue affects ash_typescript: from 0.15.0 before 0.18.0. | |
| Title | Declared argument constraints not enforced on AshTypescript typed controller routes | |
| First Time appeared |
Ash-project
Ash-project ash Typescript |
|
| Weaknesses | CWE-20 | |
| CPEs | cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Ash-project
Ash-project ash Typescript |
|
| References |
| |
| Metrics |
cvssV4_0
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Projects
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MITRE
Status: PUBLISHED
Assigner: EEF
Published:
Updated: 2026-09-01T02:09:15.070Z
Reserved: 2026-08-31T00:59:10.001Z
Link: CVE-2026-82732
Vulnrichment
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NVD
Status : Received
Published: 2026-09-01T03:16:53.193
Modified: 2026-09-01T03:16:53.193
Link: CVE-2026-82732
Redhat
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OpenCVE Enrichment
Updated: 2026-09-01T03:30:04Z