CVE-2026-65635

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.

CVSS 4.0

8.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:L/SC:L/SI:L/SA:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 32% of CVEs (scores of 2026-10-25)

CWE

CWE-653

Published

2026-07-30

Modified

2026-10-23

Record from

the NVD, synced 2026-10-24

References

• https://cna.erlef.org/cves/CVE-2026-65635.html
• https://github.com/malach-it/boruta_auth/commit/82584c854a332482232fd25301ab12a835f9f643
• https://github.com/malach-it/boruta_auth/commit/95619a1beaff68fa766cca9b388e7c780d182525
• https://github.com/malach-it/boruta_auth/security/advisories/GHSA-w869-fcf2-68vp
• https://osv.dev/vulnerability/EEF-CVE-2026-65635

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