CVE-2018-17126: CScms 4.1 allows remote code execution, as demonstrated by 1');eval($_POST[cmd]);# in Web Name to upload\plugi

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2018-17126 is a critical-severity flaw (CVSS 9.8) affecting cscms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CScms 4.1 allows remote code execution, as demonstrated by 1');eval($_POST[cmd]);# in Web Name to upload\plugins\sys\Install.php.

Why this priority

Critical severity
Public exploit reference
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	3.2% (top 12%)
CISA exploited list	No
Weakness	CWE-94
Published	2018-09-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: chshcms

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

Am I affected?

Timeline

2018-09-17 04:29 UTCPublished CVE record published
2026-06-17 01:45 UTCUpdated Record last modified

chshcms cscms DOWNGRADE

Affected: 4.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.1 (Debian / Ubuntu)

apt-cache madison cscms sudo apt install cscms=<VERSION_BEFORE_4.1> sudo apt-mark hold cscms

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

dnf --showduplicates list cscms sudo dnf downgrade cscms-<VERSION_BEFORE_4.1> sudo dnf versionlock add cscms

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-2018-17126?

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

Is CVE-2018-17126 being exploited?

CVE-2018-17126 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-2018-17126 affect?

CVE-2018-17126 affects cscms. Severity is critical (CVSS 9.8). CScms 4.1 allows remote code execution, as demonstrated by 1');eval($_POST[cmd]);# in Web Name to upload\plugins\sys\Install.php.

How urgent is CVE-2018-17126?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

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References

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