CVE-2026-5136
HIGH 8.8A 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.
Severe if exploited (CVSS 8.8), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.3%chance of exploitation in 30 days · 22nd percentile
Impact if exploited
8.8CVSS 3.1 · HIGH
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityHigh
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ⚠Privileges: Requires a low-privilege account
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept & exploit code
- github-search Search GitHub for public PoC repos
Test against your own equipment
curl -s https://vulnpedia.com/cve/CVE-2026-5136/poc.jsonMachine-readable PoC index for this CVE (for automation).Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-5136/poc.json
Affected
Vendors Red Hat Redhat Theforeman
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 Satellite Enterprise Linux Foreman
Weakness (CWE)
- CWE-266: Incorrect Privilege Assignment
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Redhat | Satellite | ≥ 6.16 and < 6.16.10 |
| Redhat | Satellite | ≥ 6.17 and < 6.17.9 |
| Redhat | Satellite | ≥ 6.18 and < 6.18.7 |
| Redhat | Satellite | ≥ 6.19 and < 6.19.2 |
| Theforeman | Foreman | < 3.18.2 |
| Theforeman | Foreman | ≥ 3.19.0 and < 3.19.1 |
All CVSS metrics
- HIGH 8.8 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - HIGH 8.8 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
Advisories
- https://access.redhat.com/errata/RHSA-2026:34365
- https://access.redhat.com/errata/RHSA-2026:34366
- https://access.redhat.com/errata/RHSA-2026:34367
- https://access.redhat.com/errata/RHSA-2026:34368
- https://access.redhat.com/security/cve/CVE-2026-5136
- https://bugzilla.redhat.com/show_bug.cgi?id=2452970