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Fencer Vulns
high 8.8

CVE-2018-6383 in the critical feed json

Monstra CMS through 3.0.4 has an incomplete "forbidden types" list that excludes .php (and similar) file extensions but not the .pht or .ph…

published 2018-01-29 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-18140

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
13.5%
EPSS 13.5% chance of exploitation in 30 days, percentile 96%
public exploits
1
Exploit-DB

Summary

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.

Timeline

  1. Published
  2. First public exploit (EDB-49949)

Exploit prediction

13.50% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-49949 Monstra CMS 3.0.4 - Remote Code Execution (Authenticated) webapps, 2021-06-04
  • github.com https://github.com/monstra-cms/monstra/issues/429 referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/162968/Monstra-CMS-3.0.4-Remote-Code-Execution.html referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/Hacker5preme/Exploits/tree/main/CVE-2018-6383-Exploit referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P

Classification

Weakness
  • CWE-184 Incomplete List of Disallowed Inputs

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.