CVE-2026-81853

Summary

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.

Affected Software

Weaknesses

• CWE-639: CWE-639 Authorization Bypass Through User-Controlled Key

References

• https://github.com/ash-project/ash_admin/security/advisories/GHSA-jxr8-hpv2-qp38
• https://cna.erlef.org/cves/CVE-2026-81853.html
• https://osv.dev/vulnerability/EEF-CVE-2026-81853
• https://github.com/ash-project/ash_admin/commit/3c3e905d47f1155dcc1ca3fb347348b05a66065a

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