Nagios Enterprises Nagios XI up to 2026R1.7 MIB Upload Feature mibs.php install_mib os command injection

Summaryinfo

A vulnerability classified as problematic was found in Nagios Enterprises Nagios XI. Affected by this vulnerability is the function install_mib of the file mibs.php of the component MIB Upload Feature. Executing a manipulation can lead to os command injection. This vulnerability is handled as CVE-2026-119742. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in Nagios Enterprises Nagios XI and classified as problematic. This vulnerability affects the function install_mib of the file mibs.php of the component MIB Upload Feature. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Nagios XI before 2026R2 contains an OS command injection vulnerability in the MIB upload feature where the install_mib() function in mibs.php sanitizes uploaded filenames with an incomplete character deny-list that omits semicolons and pipes before passing them to a grep command executed via exec(). An authenticated administrator can upload a MIB file with a crafted filename using tab characters to bypass the deny-list and pipe to sh via a multipart POST request to mibs.php, resulting in arbitrary OS command execution as the web server user.

The advisory is shared for download at nagios.com. This vulnerability was named CVE-2026-119742 since 10/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. The exploitation needs additional levels of successful authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1202.

By approaching the search of inurl:mibs.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2026R2 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Log Management Software

Vendor

• Nagios Enterprises

Name

• Nagios XI

Version

• 4.5.13
• 4.5.14
• 2026R1.4
• 2026R1.5
• 2026R1.7

License

• commercial

CPE 2.3info

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• 🔒
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CPE 2.2info

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• 🔒

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Once again VulDB remains the best source for vulnerability data.

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