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.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
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
Which versions are affected by CVE-2026-56098?
How do I fix CVE-2026-56098?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-56098 being exploited?
There is no known exploitation of CVE-2026-56098 in the wild and no public exploit code.
Sources
Also known as GHSA-f6cg-x72x-c392.