CVE-2018-1000226: Cobbler version Verified as present in Cobbler versions 2.6.11+, but code inspection suggests at least 2.0.0+

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2018-1000226 is a critical-severity flaw (CVSS 9.8) affecting cobbler. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cobbler version Verified as present in Cobbler versions 2.6.11+, but code inspection suggests at least 2.0.0+ or possibly even older versions may be vulnerable contains a Incorrect Access Control vulnerability in XMLRPC API (/cobbler_api) that can result in Privilege escalation, data manipulation or exfiltration, LDAP credential harvesting. This attack appear to be exploitable via "network connectivity". Taking advantage of improper validation of

Why this priority

Critical severity
EPSS top 4%: very likely to be exploited
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	12.6% (top 4%)
CISA exploited list	No
Weakness	CWE-732
Published	2018-08-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cobblerd

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-08-20 20:29 UTCPublished CVE record published
2026-06-17 01:32 UTCUpdated Record last modified

cobblerd cobbler DOWNGRADE

Affected: >= 2.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison cobbler sudo apt install cobbler=<VERSION_BEFORE_2.0.0> sudo apt-mark hold cobbler

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cobbler sudo dnf downgrade cobbler-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add cobbler

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: Cobbler - Authentication Bypass

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-2018-1000226?

cobbler: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-1000226 being exploited?

CVE-2018-1000226 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-2018-1000226 affect?

CVE-2018-1000226 affects cobbler. Severity is critical (CVSS 9.8). Cobbler version Verified as present in Cobbler versions 2.6.11+, but code inspection suggests at least 2.0.0+ or possibly even older versions may be vulnerable contains a Incorrect Access Control vulnerability in XMLRPC API (/cobbler_api) t

How urgent is CVE-2018-1000226?

Priority 63/100. Critical severity; EPSS top 4%: very likely to be exploited; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-0860 CRITICAL 9.1 UPGRADE MITIGATE Improper Authorization in GitHub repository cobbler/cobbler prior to 3.3.2.
CVE-2021-45083 HIGH 7.1 UPGRADE MITIGATE An issue was discovered in Cobbler before 3.3.1
CVE-2021-45082 HIGH 7.8 UPGRADE MITIGATE An issue was discovered in Cobbler before 3.3.1
CVE-2021-45081 MEDIUM 5.9 UPGRADE An issue was discovered in Cobbler through 3.3.1
CVE-2021-40325 HIGH 7.5 UPGRADE Cobbler before 3.3.0 allows authorization bypass for modification of settings.

References

← Back to latest CVEs