ash-project ash_admin up to 1.3.0 Helpers AshAdmin.Helpers.decode_primary_key authorization

Summaryinfo

A vulnerability categorized as problematic has been discovered in ash-project ash_admin up to 1.3.0. The affected element is the function AshAdmin.Helpers.decode_primary_key of the component Helpers. Executing a manipulation can lead to authorization. This vulnerability is handled as CVE-2026-81853. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic was found in ash-project ash_admin up to 1.3.0. This vulnerability affects the function AshAdmin.Helpers.decode_primary_key of the component Helpers. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. As an impact it is known to affect confidentiality. CVE summarizes:

Authorization Bypass Through User-Controlled Key vulnerability in ash-project ash_admin turns a record-lookup URL into an equality oracle over sensitive attributes. AshAdmin.Helpers.decode_primary_key/2 decodes the composite-primary-key form (Base64 plus ETF) and returns the decoded map verbatim as the lookup filter, without checking that its keys are the resource's primary-key fields. The deserialization guards bound size, block new atoms and funs, and reject nested expressions, but none restricts which fields come back, and :safe still allows any already-interned attribute name. An attacker can therefore encode %{api_token: "guess"} and have it spliced into the lookup filter, brute-forcing a sensitive attribute value (API token, reset token) one equality guess at a time; Map.to_list/1 also accepts structs, yielding a bogus __struct__ key. The fix rejects any decoded key that is not a real primary-key field. This issue affects ash_admin: from 0.1.0 before 1.3.1.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-81853 since 08/31/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available.

Upgrading to version 1.3.1 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• ash-project

Name

• ash_admin

Version

• 1.0
• 1.1
• 1.2
• 1.3.0

Website

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

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