CVE-2020-10806: eZ Publish Kernel before 5.4.14.1, 6.x before 6.13.6.2, and 7.x before 7.5.6.2 and eZ Publish Legacy before 5.

This week

CRITICAL 9.8REMOTEUPGRADEUPGRADE

CVE-2020-10806 is a critical-severity flaw (CVSS 9.8) affecting ez publish-kernel, ez publish-legacy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

eZ Publish Kernel before 5.4.14.1, 6.x before 6.13.6.2, and 7.x before 7.5.6.2 and eZ Publish Legacy before 5.4.14.1, 2017 before 2017.12.7.2, and 2019 before 2019.03.4.2 allow remote attackers to execute arbitrary code by uploading PHP code, unless the vhost configuration permits only app.php execution.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Weakness	CWE-434
Published	2020-03-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ez

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

Am I affected?

Timeline

2020-03-22 16:15 UTCPublished CVE record published
2026-06-17 02:48 UTCUpdated Record last modified

ez ez publish-kernel UPGRADE

Affected: < 5.4.14.1 · >= 6.0.0 and < 6.13.6.2 · >= 7.0.0 and < 7.5.6.2

Fixed in: 5.4.14.1, 6.13.6.2, 7.5.6.2

Safe to downgrade to: a release before 6.0.0

1. Check installed version

apt-cache policy ez-publish-kernel || rpm -q ez-publish-kernel || ez-publish-kernel --version

2. UPGRADE to 5.4.14.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ez-publish-kernel

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ez-publish-kernel

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 6.0.0 (Debian / Ubuntu)

apt-cache madison ez-publish-kernel sudo apt install ez-publish-kernel=<VERSION_BEFORE_6.0.0> sudo apt-mark hold ez-publish-kernel

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

dnf --showduplicates list ez-publish-kernel sudo dnf downgrade ez-publish-kernel-<VERSION_BEFORE_6.0.0> sudo dnf versionlock add ez-publish-kernel

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.

ez ez publish-legacy UPGRADE

Affected: < 5.4.14.1 · >= 2017.0 and < 2017.12.7.2 · >= 2019.0 and < 2019.03.4.2

Fixed in: 5.4.14.1, 2017.12.7.2, 2019.03.4.2

Safe to downgrade to: a release before 2017.0

1. Check installed version

apt-cache policy ez-publish-legacy || rpm -q ez-publish-legacy || ez-publish-legacy --version

2. UPGRADE to 5.4.14.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ez-publish-legacy

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ez-publish-legacy

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 2017.0 (Debian / Ubuntu)

apt-cache madison ez-publish-legacy sudo apt install ez-publish-legacy=<VERSION_BEFORE_2017.0> sudo apt-mark hold ez-publish-legacy

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

dnf --showduplicates list ez-publish-legacy sudo dnf downgrade ez-publish-legacy-<VERSION_BEFORE_2017.0> sudo dnf versionlock add ez-publish-legacy

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.

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-2020-10806?

ez publish-kernel: upgrade to 5.4.14.1, 6.13.6.2, 7.5.6.2; ez publish-legacy: upgrade to 5.4.14.1, 2017.12.7.2, 2019.03.4.2. Exact commands for each OS are on this page.

Is CVE-2020-10806 being exploited?

CVE-2020-10806 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-2020-10806 affect?

CVE-2020-10806 affects ez publish-kernel, ez publish-legacy. Severity is critical (CVSS 9.8). eZ Publish Kernel before 5.4.14.1, 6.x before 6.13.6.2, and 7.x before 7.5.6.2 and eZ Publish Legacy before 5.4.14.1, 2017 before 2017.12.7.2, and 2019 before 2019.03.4.2 allow remote attackers to execute arbitrary code by uploading PHP cod

How urgent is CVE-2020-10806?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

References

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