🛡️ CVE-2026-48695 — fastnetmon

🟠 CVSS 8.1 — High ✅ No Known Exploit CWE-78 NVD
8.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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().

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability none.

Weakness class

CVE-2026-48695 is classified as CWE-78: OS Command Injection. Untrusted input reaches a shell command without neutralisation, so an attacker can run arbitrary operating system commands.

Affected software

CVE-2026-48695 is recorded against 2 packages.

  • fastnetmon (fixed in 1.2.9)
  • unknown

Timeline and source

Published on 26 May 2026 and last revised on 21 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
github.com
lorikeetsecurity.com

CVE-2026-48695 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 8.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE CWE-78
Public Exploit ✅ No
Source NVD
Published 2026-05-26
Updated 2026-08-11
Modified 2026-07-21
Fix URL N/A

Affected Packages

Software From version Fixed in
fastnetmon — 1.2.9
unknown — —

Similar Threats

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