ash-project ash_typescript up to 0.17.x RPC Result Processor result_processor.ex normalize_primitive improper authorization

Summaryinfo

A vulnerability was found in ash-project ash_typescript up to 0.17.x. It has been rated as problematic. This affects the function normalize_primitive of the file lib/ash_typescript/rpc/result_processor.ex of the component RPC Result Processor. Performing a manipulation results in improper authorization. This vulnerability is cataloged as CVE-2026-82730. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in ash-project ash_typescript up to 0.17.x. It has been classified as problematic. This affects the function normalize_primitive of the file lib/ash_typescript/rpc/result_processor.ex of the component RPC Result Processor. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality. The summary by CVE is:

Incorrect Authorization vulnerability in ash-project ash_typescript allows an unauthorized RPC caller to read attribute values that Ash field policies denied. When a field policy denies an attribute, Ash substitutes %Ash.ForbiddenField{}, which retains the real value in original_value because embedded resources must remain writable, and hides it from Inspect rather than removing it. AshTypescript.Rpc.ResultProcessor strips these markers to nil on its template-driven paths, but normalize_primitive/1 in lib/ash_typescript/rpc/result_processor.ex had no such clause, so a marker fell through to the generic struct branch which calls Map.from_struct/1 and serializes every key, original_value included. The denied value is returned to the caller inside the marker that represents its own denial. The simplest trigger is an action returning an embedded resource as a map, which routes through normalize_resource_struct/2 with an empty template. normalize_value_for_json/1 is a public, unguarded entry point to the same path. This issue affects ash_typescript: from 0.11.0 before 0.18.0.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-82730 since 08/31/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

Upgrading to version 0.18.0 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• ash-project

Name

• ash_typescript

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17

Website

• Product: https://github.com/ash-project/ash_typescript/

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