CVE-2018-18874: nc-cms through 2017-03-10 allows remote attackers to execute arbitrary PHP code via the "Upload File or Image"

Q: How do I fix CVE-2018-18874?

nc-cms: upgrade to newer than 2017-03-10. Exact commands for each OS are on this page.

Q: Is CVE-2018-18874 being exploited?

CVE-2018-18874 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-18874 affect?

CVE-2018-18874 affects nc-cms. Severity is critical (CVSS 9.8). nc-cms through 2017-03-10 allows remote attackers to execute arbitrary PHP code via the "Upload File or Image" feature, with a .php filename and "Content-Type: application/octet-stream" to the index.php?action=file_manager_upload URI.

Q: How urgent is CVE-2018-18874?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2018-18874 is a critical-severity flaw (CVSS 9.8) affecting nc-cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

nc-cms through 2017-03-10 allows remote attackers to execute arbitrary PHP code via the "Upload File or Image" feature, with a .php filename and "Content-Type: application/octet-stream" to the index.php?action=file_manager_upload URI.

Why this priority

Critical severity
Public exploit reference
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	2.1% (top 19%)
CISA exploited list	No
Weakness	CWE-434
Published	2018-10-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nconsulting

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

Am I affected?

Timeline

2018-10-31 16:29 UTCPublished CVE record published
2026-06-17 01:48 UTCUpdated Record last modified

nconsulting nc-cms UPGRADE

Affected: <= 2017-03-10

Fixed in: newer than 2017-03-10

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nc-cms || rpm -q nc-cms || nc-cms --version

2. UPGRADE to newer than 2017-03-10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nc-cms

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nc-cms

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2018-18874?

nc-cms: upgrade to newer than 2017-03-10. Exact commands for each OS are on this page.

Is CVE-2018-18874 being exploited?

CVE-2018-18874 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-2018-18874 affect?

CVE-2018-18874 affects nc-cms. Severity is critical (CVSS 9.8). nc-cms through 2017-03-10 allows remote attackers to execute arbitrary PHP code via the "Upload File or Image" feature, with a .php filename and "Content-Type: application/octet-stream" to the index.php?action=file_manager_upload URI.

How urgent is CVE-2018-18874?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2019-7721 HIGH 7.5 DOWNGRADE lib/NCCms.class.php in nc-cms 3.5 allows upload of .php files via the index.php?action=save name and editordat
CVE-2018-18361 MEDIUM 6.1 UPGRADE An issue was discovered in nc-cms through 2017-03-10
CVE-2018-18290 MEDIUM 4.8 UPGRADE An issue was discovered in nc-cms through 2017-03-10

References

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