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

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-01 · updated 2026-10-07
Weakness: CWE-203

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.

Affected products

Red Hat Satellite 6.16 for RHEL 8: all versions — fixed in 0:4.14.0.23-1.el8sat
Red Hat Satellite 6.16 for RHEL 9: all versions — fixed in 0:4.14.0.23-1.el9sat
Red Hat Satellite 6.17 for RHEL 9: all versions — fixed in 0:4.16.0.20-1.el9sat
Red Hat Satellite 6.18 for RHEL 9: all versions — fixed in 0:4.18.0.24-1.el9sat
Red Hat Satellite 6.19 for RHEL 9: all versions — fixed in 0:4.20.0.11-1.el9sat
Red Hat Satellite 6: all versions

How to fix

Upgrade to a fixed version: Red Hat Satellite 6.16 for RHEL 8 0:4.14.0.23-1.el8sat; Red Hat Satellite 6.16 for RHEL 9 0:4.14.0.23-1.el9sat; Red Hat Satellite 6.17 for RHEL 9 0:4.16.0.20-1.el9sat; Red Hat Satellite 6.18 for RHEL 9 0:4.18.0.24-1.el9sat; Red Hat Satellite 6.19 for RHEL 9 0:4.20.0.11-1.el9sat. Check the vendor advisory for mitigations.

References

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