# CVE-2026-81668: Rubygem-katello: cross-tenant content view filter rule access and modification via unauthorized parent filter lookup

Status: published. Published: 2026-08-27. Updated: 2026-11-13.

A flaw was found in Katello where the Content View Filter Rules API does not properly enforce authorization on the parent Content View Filter. An authenticated, low-privileged user with Content View permissions in one organization may be able to access and modify filter rules belonging to a Content View Filter in another organization by supplying that filter's identifier. This can result in unauthorized disclosure of filter-rule information and unauthorized changes to unpublished Content View filter configuration.

## Remediation

- workaround: Red Hat is not aware of a practical temporary workaround that fully mitigates this issue or meets Red Hat Product Security's standards for usability, deployment, applicability, or stability. Customers are advised to apply the relevant security updates when they become available. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Satellite 6.16 for RHEL 8 (rubygem-katello): ≥ 0:4.14.0.24-1.el8sat; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Satellite 6.16 for RHEL 9 (rubygem-katello): ≥ 0:4.14.0.24-1.el9sat; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Satellite 6.17 for RHEL 9 (rubygem-katello): ≥ 0:4.16.0.23-1.el9sat; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Satellite 6.18 for RHEL 9 (rubygem-katello): ≥ 0:4.18.0.29-1.el9sat; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Satellite 6 (katello): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 5.4 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.24% as of 2026-11-12; percentile 15.15%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-639

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2026:99949 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:99950 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:99952 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-81668 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2524928 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-81668; retrieved 2026-11-13; source updated 2026-11-13

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-81668; retrieved 2026-11-13; source updated Not reported

Revision: 9b177382e0a0fc3ecc423bc112a742e8208fc421e5945836bccb1cefaba48f57

Canonical: https://y2.dev/cve/CVE-2026-81668

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