# CVE-2026-65635: Boruta dynamic client registration allows creation of over-privileged OAuth clients

> Attackers can register over-privileged OAuth clients via dynamic registration, bypassing administrative controls in the Boruta library.

- **Severity:** High 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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 30 Jul 2026
- **Updated:** 31 Jul 2026
- **Also known as:** EEF-CVE-2026-65635, GHSA-w869-fcf2-68vp

## What is CVE-2026-65635?

CVE-2026-65635 is a high-severity vulnerability in malach-it boruta, published on 30 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### 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.

Weakness: CWE-653 (Improper Isolation or Compartmentalization)

## Which versions are affected by CVE-2026-65635?

1 open source package ship an affected version, including boruta.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `boruta` | Hex | From 2.3.0 | 2.3.7 |

## How do I fix CVE-2026-65635?

Upgrade boruta to 2.3.7 or later.

## Is CVE-2026-65635 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-65635 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-65635 and fix it if it is affected.

What it is: CVE-2026-65635 is a high-severity vulnerability in malach-it boruta, published on 30 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-65635 exists.

Affected packages and fixed versions:
- boruta (Hex): affected from 2.3.0; fixed in 2.3.7

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-65635/ (Markdown: https://insights.sbomify.com/CVE-2026-65635/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-65635
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-65635
- OSV: https://osv.dev/vulnerability/CVE-2026-65635

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-65635/
Summaries are generated and may contain mistakes; the official description above is the record.