# CVE-2026-56098: Rubygem-katello: improper authorization logic allows resource enumeration

> An authorization bypass in Katello allows unprivileged attackers to enumerate valid users, organizations, and products via differential responses.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 1 Oct 2026
- **Updated:** 7 Oct 2026
- **Also known as:** GHSA-f6cg-x72x-c392

## What is CVE-2026-56098?

CVE-2026-56098 is a medium-severity missing authorization vulnerability in Red Hat Satellite 6, published on 1 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A flaw was found in rubygem-katello. The RegistryProxiesController in Katello contains an authorization bypass vulnerability due to an execution fall-through in the registry_authorize filter. While the application identifies unauthorized requests and triggers an error response via the unauthorized method, it fails to halt the execution of the current code path (missing return statement). This failure in the control flow allows the application to proceed into subsequent business logic and database validation filters. Consequently, the application reveals its internal state through differential responses, allowing an unprivileged attacker to enumerate valid Users, Organizations, and Products across the entire instance.

Weakness: CWE-203 (Observable Discrepancy)

## Which versions are affected by CVE-2026-56098?


## How do I fix CVE-2026-56098?

Apply the vendor's patch.

## Is CVE-2026-56098 being exploited?

There is no known exploitation of CVE-2026-56098 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-56098 and fix it if it is affected.

What it is: CVE-2026-56098 is a medium-severity missing authorization vulnerability in Red Hat Satellite 6, published on 1 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-56098 in the wild and no public exploit code.

Affected product: Red Hat Satellite 6. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-56098/ (Markdown: https://insights.sbomify.com/CVE-2026-56098/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-56098
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-56098
- OSV: https://osv.dev/vulnerability/CVE-2026-56098

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-56098/
Summaries are generated and may contain mistakes; the official description above is the record.