CVE-2026-82747

Summary

Incorrect Authorization vulnerability in ash-project ash returns records that a runtime read policy denies to any actor.

When a resource has an access_type :runtime read policy (a check evaluated per record rather than compiled to a filter), Ash.Policy.Authorizer decides each record in check_result/1 (lib/ash/policy/authorizer/authorizer.ex) by discarding impossible policy scenarios and inspecting what remains. When every scenario for a record was impossible, meaning no policy can authorize it and it must be forbidden, the empty-scenario branch instead kept the record ({[record | data], authorizer, any_forbidden?}) and returned it as authorized. As a result, records the runtime read policy denies are returned to any actor. The fix forbids a record whose scenarios are all impossible.

This issue affects ash: from 3.4.44 before 3.32.2.

Affected Software

Weaknesses

• CWE-863: CWE-863 Incorrect Authorization

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/ash-project/ash/security/advisories/GHSA-4259-gvr2-4xhq

References

• https://github.com/ash-project/ash/security/advisories/GHSA-4259-gvr2-4xhq
• https://cna.erlef.org/cves/CVE-2026-82747.html
• https://osv.dev/vulnerability/EEF-CVE-2026-82747
• https://github.com/ash-project/ash/commit/6eddb8ab26e45023faf0c79ebd152bb40aefda02

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