High [CVE-2026-5136] Privilege escalation to administrator-level access via usergroup role assignment manipulation
This high-severity Red Hat Linux advisory covers CVE-2026-5136 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. The Usergroup model in Foreman does not properly validate role assignments against the calling user's permissions.
This allows an authenticated user with usergroup management permissions to attach arbitrary roles, including administrative roles, to a user group and then add themselves as a member. Successful exploitation of this vulnerability leads to full privilege escalation, granting the attacker administrator-level access.
Red Hat severity: Important — CVSS 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-266.
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 21 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 21 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 21 days ago·verify at source
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