Medium [CVE-2026-5138] Information disclosure via improper validation of nested request parameters
This medium-severity Red Hat Linux advisory covers CVE-2026-5138 affecting Red Hat Satellite 6.16 for RHEL 8, Red Hat Satellite 6.16 for RHEL 9, Red Hat Satellite 6.17 for RHEL 9.
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Summary
A flaw was found in Foreman. An authenticated user with host-edit permissions could exploit a cross-tenant information disclosure vulnerability.
This flaw occurs because the taxonomy_scope controller method does not properly validate organization and location IDs from nested request parameters, bypassing existing authorization checks.
This allows the user to leak sensitive infrastructure metadata, including subnet topology, IP ranges, gateways, DNS servers, and VLAN IDs, from organizations and locations they are not authorized to access. Red Hat severity: Moderate — CVSS 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N).
Weakness: CWE-639. Affected Red Hat products: Red Hat Satellite 6.16 for RHEL 8; Red Hat Satellite 6.16 for RHEL 9; Red Hat Satellite 6.17 for RHEL 9; Red Hat Satellite 6.18 for RHEL 9; Red Hat Satellite 6.19 for RHEL 9; Red Hat Satellite 6.
Red Hat fixing advisory: RHSA-2026:34367, RHSA-2026:34366, RHSA-2026:34368, RHSA-2026:34365.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 23 days ago·verify at source
- foreman-0:3.12.0.17-1.el8sat
- foreman-0:3.12.0.17-1.el9sat
- foreman-0:3.14.0.17-1.el9sat
- foreman-0:3.16.0.17-1.el9sat
- foreman-0:3.18.0.7-1.el9sat
- RHSA-2026:34367
- RHSA-2026:34366
- RHSA-2026:34368
- RHSA-2026:34365
Official advisory · high-confidence parse· fetched 23 days ago·verify at source
Mitigation
Upgrade to a fixed release: foreman-0:3.12.0.17-1.el8sat, foreman-0:3.12.0.17-1.el9sat, foreman-0:3.14.0.17-1.el9sat, foreman-0:3.16.0.17-1.el9sat, foreman-0:3.18.0.7-1.el9sat, RHSA-2026:34367. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 23 days ago·verify at source
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