CVE-2026-65635

01/Description

Improper Isolation or Compartmentalization vulnerability in malach-it boruta (Elixir.Boruta.Openid module) allows attackers to register OpenID Connect clients with administrative privileges through the dynamic client registration entry point. Boruta.Openid.register_client/3 forwards caller-supplied registration parameters to the administrative client creation path without a public/admin field-level allowlist, so an unauthenticated registrant can set security-sensitive attributes including supported grant types, authorized scopes, PKCE enforcement, public refresh and revocation behavior, token lifetimes, and signing settings. The library does not distinguish between metadata a public registrant is allowed to set and administrative controls that should require operator approval. This vulnerability is associated with program files lib/boruta/openid.ex and program routines 'Elixir.Boruta.Openid':register_client/3, 'Elixir.Boruta.Openid':parse_registration_params/2. This issue affects boruta from 2.3.0 before 2.3.7.

02/References6

• cna.erlef.org/cves/CVE-2026-65635.html
• github.com/malach-it/boruta_auth/commit/82584c854a332482232fd25…
• github.com/malach-it/boruta_auth/commit/95619a1beaff68fa766cca9…
• github.com/malach-it/boruta_auth/security/advisories/GHSA-w869-…
• osv.dev/vulnerability/EEF-CVE-2026-65635
• github.com/malach-it/boruta_auth/security/advisories/GHSA-w869-…