HOMEVULNERABILITIESCVE-2018-6383
HIGHPOC

CVE-2018-6383

CWE-184Published: January 29, 2018· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2018-6383 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

A proof-of-concept (PoC) exploit exists for CVE-2018-6383. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

monstra1 product(s)
monstra
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://packetstormsecurity.com/files/162968/Monstra-CMS-3.0.4-Remote-Code-Execution.html
ADVISORYhttps://github.com/Hacker5preme/Exploits/tree/main/CVE-2018-6383-Exploit
ADVISORYhttps://github.com/monstra-cms/monstra/issues/429
ADVISORYhttp://packetstormsecurity.com/files/162968/Monstra-CMS-3.0.4-Remote-Code-Execution.html
ADVISORYhttps://github.com/Hacker5preme/Exploits/tree/main/CVE-2018-6383-Exploit
ADVISORYhttps://github.com/monstra-cms/monstra/issues/429

All References (6)

→
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

Quick Facts

CVE IDCVE-2018-6383
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-184
CISA KEVNo
ExploitPOC
Affected1 vendor(s)
PublishedJan 29, 2018

Related CVEs (CWE-184)

CVE-2017-7540
9.8
CVE-2026-28391
9.8
CVE-2026-53873
9.8
CVE-2026-43566
9.8
CVE-2019-9212
9.8
CVE-2025-71323
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-6383 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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