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Fencer Vulns
medium 4.3

CVE-2026-56098 json

Rubygem-katello: improper authorization logic allows resource enumeration

published 2026-10-01 38 d ago modified 2026-10-07 33 d ago also EUVD-2026-90971

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Satellite 6.16 for RHEL 8 0:4.14.0.23-1.el8sat
  • Red Hat Red Hat Satellite 6.16 for RHEL 9 0:4.14.0.23-1.el9sat
  • Red Hat Red Hat Satellite 6.17 for RHEL 9 0:4.16.0.20-1.el9sat
  • Red Hat Red Hat Satellite 6.18 for RHEL 9 0:4.18.0.24-1.el9sat
  • Red Hat Red Hat Satellite 6.19 for RHEL 9 0:4.20.0.11-1.el9sat
  • foreman satellite utils 6.17, satellite capsule 6.17, satellite 6.17 3.14.0.22-1.el9sat
  • satellite satellite utils 6.17, satellite capsule 6.17, satellite 6.17 6.17.12-1.el9sat
  • foreman-cli satellite utils 6.17, satellite 6.17 3.14.0.22-1.el9sat
  • foreman-ec2 satellite 6.17 3.14.0.22-1.el9sat
  • foreman-pcp satellite capsule 6.17, satellite 6.17 3.14.0.22-1.el9sat
  • python-lxml satellite capsule 6.17, satellite 6.17 5.3.1-2.el9pc
  • foreman-ovirt satellite 6.17 3.14.0.22-1.el9sat
  • foreman-redis satellite 6.17 3.14.0.22-1.el9sat

red hat advisories RHSA-2026:74505RHSA-2026:74504RHSA-2026:74506RHSA-2026:74503

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-56098 updated cvss 4.3

rubygem-katello: improper authorization logic allows resource enumeration

  • Red Hat Satellite 6 katello, katello-common, katello-capsule, katello-service, rubygem-katello, foreman-proxy-content
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Satellite 6.16 for RHEL 8 rubygem-katello 4.14.0.23-1.el8sat Red Hat Satellite 6.16 for RHEL 9 rubygem-katello 4.14.0.23-1.el9sat
    fixed: vendor fix RHSA-2026:74506
  • Red Hat Satellite 6.17 for RHEL 9 rubygem-katello 4.16.0.20-1.el9sat
    fixed: vendor fix RHSA-2026:74505
  • Red Hat Satellite 6.18 for RHEL 9 rubygem-katello 4.18.0.24-1.el9sat
    fixed: vendor fix RHSA-2026:74504
  • Red Hat Satellite 6.19 for RHEL 9 rubygem-katello 4.20.0.11-1.el9sat
    fixed: vendor fix RHSA-2026:74503
  • Red Hat Satellite 6.16 for RHEL 8 python-lxml 4.9.2-5.el8pc, foreman 3.12.0.23-1.el8sat, satellite 6.16.14-1.el8sat, python-sqlparse 0.6.0-1.el8pc, python3.11-lxml 4.9.2-5.el8pc, foreman-cli 3.12.0.23-1.el8sat, +27 more Red Hat Satellite 6.16 for RHEL 9 python-lxml 4.9.2-5.el9pc, foreman 3.12.0.23-1.el9sat, satellite 6.16.14-1.el9sat, python-sqlparse 0.6.0-1.el9pc, python3.11-lxml 4.9.2-5.el9pc, foreman-cli 3.12.0.23-1.el9sat, +27 more Red Hat Satellite 6.17 for RHEL 9 python-lxml 5.3.1-2.el9pc, foreman 3.14.0.22-1.el9sat, satellite 6.17.12-1.el9sat, python-sqlparse 0.6.0-1.el9pc, python3.11-lxml 5.3.1-2.el9pc, foreman-cli 3.14.0.22-1.el9sat, +26 more Red Hat Satellite 6.18 for RHEL 9 foreman 3.16.0.25-1.el9sat, satellite 6.18.10-1.el9sat, foreman-cli 3.16.0.25-1.el9sat, foreman-ec2 3.16.0.25-1.el9sat, foreman-pcp 3.16.0.25-1.el9sat, satellite-cli 6.18.10-1.el9sat, +21 more Red Hat Satellite 6.19 for RHEL 9 satellite 6.19.5-1.el9sat, foreman 3.18.0.14-1.el9sat, satellite-cli 6.19.5-1.el9sat, foreman-cli 3.18.0.14-1.el9sat, foreman-ec2 3.18.0.14-1.el9sat, foreman-pcp 3.18.0.14-1.el9sat, +23 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
38 d ago

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

  • Red Hat Red Hat Satellite 6.16 for RHEL 8
  • Red Hat Red Hat Satellite 6.16 for RHEL 9
  • Red Hat Red Hat Satellite 6.17 for RHEL 9
  • Red Hat Red Hat Satellite 6.18 for RHEL 9
  • Red Hat Red Hat Satellite 6.19 for RHEL 9
  • Red Hat Red Hat Satellite 6

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.