Vulnerability · Published Jul 30, 2026 · Assigned by EEF
CVE-2026-65635Boruta dynamic client registration allows creation of over-privileged OAuth clients
High 8.3
In plain English
A high-severity security flaw in boruta from malach-it. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).
Official 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.
Affected products (as reported)
Weakness: CWE-653 · Vector: 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
References
- https://github.com/malach-it/boruta_auth/security/advisories/GHSA-w869-fcf2-68vp vendor-advisory, related
- https://cna.erlef.org/cves/CVE-2026-65635.html related
- https://osv.dev/vulnerability/EEF-CVE-2026-65635 related
- https://github.com/malach-it/boruta_auth/commit/82584c854a332482232fd25301ab12a835f9f643 patch
- https://github.com/malach-it/boruta_auth/commit/95619a1beaff68fa766cca9b388e7c780d182525 patch