CVE-2018-6383

Name: CVE-2018-6383
Creator: NVD / NIST
Published: 2018-01-29T18:29:00.22+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 13.58%

Last modified Jun 17, 2026

CVE-2018-6383 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Monstra CMS through 3.0.4 has an incomplete "forbidden types" list that excludes .php (and similar) file extensions but not the .pht or .phar extension, which allows remote authenticated Admins or Editors to execute arbitrary PHP code by uploading a file, a different vulnerability than CVE-2017-18048.. EPSS estimates a 13.58% chance of exploitation in the next 30 days.

Description

Monstra CMS through 3.0.4 has an incomplete "forbidden types" list that excludes .php (and similar) file extensions but not the .pht or .phar extension, which allows remote authenticated Admins or Editors to execute arbitrary PHP code by uploading a file, a different vulnerability than CVE-2017-18048.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

13.58%

96.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-184

Affected Software

Vendor	Product	Versions
Monstra	Monstra	<= 3.0.4

References

http://packetstormsecurity.com/files/162968/Monstra-CMS-3.0.4-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/Hacker5preme/Exploits/tree/main/CVE-2018-6383-ExploitExploit, Third Party Advisory
https://github.com/monstra-cms/monstra/issues/429Exploit, Issue Tracking, Third Party Advisory
http://packetstormsecurity.com/files/162968/Monstra-CMS-3.0.4-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/Hacker5preme/Exploits/tree/main/CVE-2018-6383-ExploitExploit, Third Party Advisory
https://github.com/monstra-cms/monstra/issues/429Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Jan 29, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-6383?

How severe is CVE-2018-6383?

CVE-2018-6383 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 13.58% probability of exploitation in the next 30 days.

How do I fix CVE-2018-6383?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-6383?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST