Auth bypass in Theforeman Foreman
CVE-2026-5135
A flaw was found in Foreman. This broken access control vulnerability allows an authenticated user with host-edit permissions to retarget an existing lookup value override to a different host. This is achieved by modifying the match field through nested host attributes, effectively bypassing authorisation checks. The consequence is the potential for unauthorised modification of managed host configurations across different organisational and location boundaries.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Theforeman Foreman
- Red Hat Satellite 6
- Red Hat Satellite 6.16 For Rhel 8 — versions 0:3.12.0.17-1.el8sat
- Red Hat Satellite 6.16 For Rhel 9 — versions 0:3.12.0.17-1.el9sat
- Red Hat Satellite 6.17 For Rhel 9 — versions 0:3.14.0.17-1.el9sat
- Red Hat Satellite 6.18 For Rhel 9 — versions 0:3.16.0.17-1.el9sat
- Red Hat Satellite 6.19 For Rhel 9 — versions 0:3.18.0.7-1.el9sat
- Red Hat Enterprise Linux — versions 8.0, 9.0
- Red Hat Satellite
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-5135 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:34367 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:34368 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:34365 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:34366 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-5135?
- CVE-2026-5135 is a medium-severity vulnerability in Theforeman Foreman, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-07-01.
- How severe is CVE-2026-5135?
- Medium severity. CVSS v3 base score is 6.5 out of 10.