CVE-2018-14399: libs\classes\attachment.class.php in PHPCMS 9.6.0 allows remote attackers to upload and execute arbitrary PHP

This month

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2018-14399 is a critical-severity flaw (CVSS 9.8) affecting phpcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

libs\classes\attachment.class.php in PHPCMS 9.6.0 allows remote attackers to upload and execute arbitrary PHP code via a .txt?.php#.jpg URI in the SRC attribute of an IMG element within info[content] JSON data to the index.php?m=member&c=index&a=register URI.

Why this priority

Critical severity
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	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-94
Published	2018-07-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: phpcms project

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

Am I affected?

Timeline

2018-07-19 05:29 UTCPublished CVE record published
2026-06-17 01:40 UTCUpdated Record last modified

phpcms project phpcms DOWNGRADE

Affected: 9.6.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.6.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 9.6.0 (Debian / Ubuntu)

apt-cache madison phpcms sudo apt install phpcms=<VERSION_BEFORE_9.6.0> sudo apt-mark hold phpcms

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

dnf --showduplicates list phpcms sudo dnf downgrade phpcms-<VERSION_BEFORE_9.6.0> sudo dnf versionlock add phpcms

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-2018-14399?

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

Is CVE-2018-14399 being exploited?

CVE-2018-14399 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-2018-14399 affect?

CVE-2018-14399 affects phpcms. Severity is critical (CVSS 9.8). libs\classes\attachment.class.php in PHPCMS 9.6.0 allows remote attackers to upload and execute arbitrary PHP code via a .txt?.php#.jpg URI in the SRC attribute of an IMG element within info[content] JSON data to the index.php?m=member&c=in

How urgent is CVE-2018-14399?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

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References

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