CVE-2026-54099: A flaw was found in the Windows Machine Config Operator (WMCO) for Red Hat OpenShift Container Platform

Routine

HIGH 8.8WATCHLISTUPGRADEMITIGATE

CVE-2026-54099 is a high-severity flaw (CVSS 8.8) affecting openshift container platform, windows machine config operator. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in the Windows Machine Config Operator (WMCO) for Red Hat OpenShift Container Platform. The WICD CSR auto-approver validates that a Certificate Signing Request contains the organization system:wicd-nodes but does not reject additional organization values such as system:masters. A compromised Windows worker node that holds WICD credentials can submit a CSR that is auto-approved and signed by the cluster, yielding a client certific

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 98%)
CISA exploited list	No
Weakness	CWE-269
Published	2026-06-22
Last modified	2026-10-14

Publisher (CNA): Red Hat, Inc. · Vendor: redhat

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-22 14:17 UTCPublished CVE record published
2026-10-14 03:17 UTCUpdated Record last modified

redhat openshift container platform UPGRADE

Affected: >= 4.0 and < 4.22.1

Fixed in: 4.22.1

Safe to downgrade to: a release before 4.0

1. Check installed version

apt-cache policy openshift-container-platform || rpm -q openshift-container-platform || openshift-container-platform --version

2. UPGRADE to 4.22.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openshift-container-platform

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openshift-container-platform

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison openshift-container-platform sudo apt install openshift-container-platform=<VERSION_BEFORE_4.0> sudo apt-mark hold openshift-container-platform

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list openshift-container-platform sudo dnf downgrade openshift-container-platform-<VERSION_BEFORE_4.0> sudo dnf versionlock add openshift-container-platform

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat windows machine config operator MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy windows-machine-config-operator || rpm -q windows-machine-config-operator || windows-machine-config-operator --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-54099?

openshift container platform: upgrade to 4.22.1; windows machine config operator: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-54099 being exploited?

CVE-2026-54099 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-54099 affect?

CVE-2026-54099 affects openshift container platform, windows machine config operator. Severity is high (CVSS 8.8). A flaw was found in the Windows Machine Config Operator (WMCO) for Red Hat OpenShift Container Platform. The WICD CSR auto-approver validates that a Certificate Signing Request contains the organization system:wicd-nodes but does not reject

How urgent is CVE-2026-54099?

Priority 36/100. High severity; On your watchlist

Software pages

Windows vulnerabilities · Red Hat OpenShift vulnerabilities

Related CVEs

CVE-2026-33845 HIGH 7.5 MITIGATE DOWNGRADE A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leadi
CVE-2026-42010 HIGH 7.1 MITIGATE MITIGATE A flaw was found in gnutls
CVE-2026-6245 MEDIUM 5.5 MITIGATE DOWNGRADE A flaw was found in the System Security Services Daemon (SSSD)
CVE-2026-3833 MEDIUM 6.5 MITIGATE MITIGATE A flaw was found in gnutls
CVE-2026-6732 MEDIUM 6.5 UPGRADE MITIGATE A flaw was found in libxml2

References

← Back to latest CVEs