CVE-2026-119742

Description

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-substitution filter that omits semicolons, pipes, and non-space IFS whitespace characters before passing them to a grep command run 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.

References

https://www.vulncheck.com/advisories/nagios-xi-2026r2-os-command-injection-via-mibs-php

https://www.nagios.com/security-disclosures/nagios-xi/2026r2/

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-115824

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS