CVE-2026-12423: A flaw was found in Foreman

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HIGH 7.5REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2026-12423 is a high-severity flaw (CVSS 7.5) affecting satellite, foreman. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in Foreman. The Red Hat Satellite /unattended/provision API endpoint is vulnerable to an authentication bypass due to a semantic logic flaw in host_verifier.rb. The application verifies the database state of a provisioning token rather than its actual presence in the incoming HTTP request. Because a host actively undergoing provisioning has an unexpired token in the database, the server's valid_host_token? method evaluates to tru

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-306
Published	2026-10-01
Last modified	2026-10-08

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

Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-01 17:17 UTCPublished CVE record published
2026-10-08 13:16 UTCUpdated Record last modified

redhat satellite UPGRADE

Affected: >= 6.16 and < 6.16.4 · >= 6.17 and < 6.17.12 · >= 6.19 and < 6.19.5 · >= 6.18 and < 6.18.10 · 6.0

Fixed in: 6.16.4, 6.17.12, 6.18.10, 6.19.5

Safe to downgrade to: a release before 6.0

1. Check installed version

apt-cache policy satellite || rpm -q satellite || satellite --version

2. UPGRADE to 6.16.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade satellite

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade satellite

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 6.0 (Debian / Ubuntu)

apt-cache madison satellite sudo apt install satellite=<VERSION_BEFORE_6.0> sudo apt-mark hold satellite

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

dnf --showduplicates list satellite sudo dnf downgrade satellite-<VERSION_BEFORE_6.0> sudo dnf versionlock add satellite

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.

theforeman foreman 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 foreman || rpm -q foreman || foreman --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-2026-12423?

satellite: upgrade to 6.16.4, 6.17.12, 6.18.10, 6.19.5; foreman: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-12423 being exploited?

CVE-2026-12423 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-2026-12423 affect?

CVE-2026-12423 affects satellite, foreman. Severity is high (CVSS 7.5). A flaw was found in Foreman. The Red Hat Satellite /unattended/provision API endpoint is vulnerable to an authentication bypass due to a semantic logic flaw in host_verifier.rb. The application verifies the database state of a provisioning

How urgent is CVE-2026-12423?

Priority 44/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Related CVEs

CVE-2026-12112 HIGH 7.8 DOWNGRADE MITIGATE A flaw was found in the foreman-mcp-server
CVE-2026-13316 MEDIUM 4.4 UPGRADE MITIGATE A flaw has been found in foreman when HTTP parameters are modified in http_proxies_controller and http_proxy f
CVE-2026-96658 HIGH 8.8 UPGRADE UPGRADE A flaw was found in Foreman
CVE-2026-96659 CRITICAL 9.1 UPGRADE UPGRADE A flaw was found in Foreman
CVE-2026-12542 MEDIUM 5.3 UPGRADE UPGRADE A flaw was found in Foreman

References

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