CVE-2026-65635
Boruta dynamic client registration allows creation of over-privileged OAuth clients
- State
- Published
- Severity
- 8.3 High
- Published
- Jul 30, 2026
- Updated
- Jul 31, 2026
- Reserved
- Jul 22, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.3 High | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:L/SC:L/SI:L/SA:N | EEF |
Weaknesses
- CWE-653 Improper Isolation or Compartmentalization
Affected Products
| Product | Versions |
|---|---|
borutamalach-it |
|
borutamalach-it |
|
References
- https://github.com/malach-it/boruta_auth/security/advisories/GHSA-w869-fcf2-68vpvendor-advisoryrelated
- https://cna.erlef.org/cves/CVE-2026-65635.htmlrelated
- https://osv.dev/vulnerability/EEF-CVE-2026-65635related
- https://github.com/malach-it/boruta_auth/commit/82584c854a332482232fd25301ab12a835f9f643patch
- https://github.com/malach-it/boruta_auth/commit/95619a1beaff68fa766cca9b388e7c780d182525patch
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