---
id: CVE-2026-48695
title: >-
  FastNetMon Community Edition through 1.2.9 contains an OS command injection
  vulnerability in the MikroTik router integration plugin
summary: >-
  FastNetMon Community Edition through 1.2.9 contains an OS command injection
  vulnerability in the MikroTik router integration plugin. The _log() function
  in src/mikrotik_plugin/fastnetmon_mikrotik.php (lines 107-108) constructs
  shell comm…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-78
  - CWE-78
vendor: pavel-odintsov
product: fastnetmon
affected:
  - fastnetmon <= 1.2.9
published: '2026-05-26'
updated: '2026-07-21'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-48695'
references:
  - url: 'https://github.com/pavel-odintsov/fastnetmon'
    label: cve@mitre.org
  - url: >-
      https://github.com/pavel-odintsov/fastnetmon/blob/master/src/mikrotik_plugin/fastnetmon_mikrotik.php
    label: cve@mitre.org
  - url: >-
      https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48695-mikrotik-cmd-injection
    label: cve@mitre.org
tags:
  - nvd
epss: 0.01659
epssPercentile: 0.75629
ingestedAt: '2026-07-22T15:04:27.441Z'
---

## Overview

FastNetMon Community Edition through 1.2.9 contains an OS command injection vulnerability in the MikroTik router integration plugin. The _log() function in src/mikrotik_plugin/fastnetmon_mikrotik.php (lines 107-108) constructs shell commands by concatenating the $msg parameter directly into exec() calls: exec("echo `date` \"- {FASTNETMON] - " . $msg . " \" >> " . $FILE_LOG_TMP). This is identical in pattern to the Juniper plugin vulnerability. The $msg variable contains unsanitized attack data from command-line arguments. An attacker who can influence argv[] values can inject arbitrary shell commands. The fix is to replace exec() with file_put_contents() or use escapeshellarg().

## Affected

- `fastnetmon <= 1.2.9`

## Remediation

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