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Fencer Intel
critical 9.8

CVE-2018-6411 json

An issue was discovered in Appnitro MachForm before 4.2.3.

published 2018-05-26 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-18168

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.5%
EPSS 5.5% chance of exploitation in 30 days, percentile 92%
public exploits
1
Exploit-DB

Summary

An issue was discovered in Appnitro MachForm before 4.2.3. When the form is set to filter a blacklist, it automatically adds dangerous extensions to the filters. If the filter is set to a whitelist, the dangerous extensions can be bypassed through ap_form_elements SQL Injection.

Timeline

  1. Published
  2. First public exploit (EDB-44804)

Exploit prediction

5.50% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-44804 MachForm < 4.2.3 - SQL Injection / Path Traversal / Upload Bypass webapps, 2018-05-30
  • metalamin.github.io https://metalamin.github.io/MachForm-not-0-day-EN/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-434 Unrestricted Upload of File with Dangerous Type

References

Sources

Fencer Intel 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.