---
id: CVE-2026-78839
title: >-
  An arbitrary file upload vulnerability in AppNitro MachForm v30 allows
  attackers to execute arbitrary code via uploading a crafted .phar file.
summary: >-
  An arbitrary file upload vulnerability in AppNitro MachForm v30 allows
  attackers to execute arbitrary code via uploading a crafted .phar file.
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-434
published: '2026-09-04'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T20:20:42.553'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78839'
references:
  - url: 'https://github.com/nabeelmkhan/CVE-2026-78839'
    label: cve@mitre.org
  - url: 'https://packetstormsecurity.com'
    label: cve@mitre.org
tags:
  - nvd
  - exploit-available
  - cve.org
epss: 0.00553
epssPercentile: 0.43806
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/nabeelmkhan/CVE-2026-78839'
  checkedAt: '2026-09-26T09:06:00.952Z'
exploitAvailable: true
ingestedAt: '2026-09-08T20:10:03.168Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-09T19:34:29.150877Z'
---

## Overview

An arbitrary file upload vulnerability in AppNitro MachForm v30 allows attackers to execute arbitrary code via uploading a crafted .phar file.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.