# CVE-2026-65635

## Summary

- **CVE ID:** CVE-2026-65635
- **Severity:** HIGH
- **CVSS Score:** 8.3 (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)
- **CWE:** CWE-653
- **Published:** Jul 30, 2026
- **Last Modified:** Jul 31, 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.

## Affected Products

- malach-it — boruta (2.3.0)
- malach-it — boruta (85481b706636fe68a43d0b8d3275e2afc7f7fee1)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 22.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._