# CVE-2026-119742

Authenticated admin OS command injection via MIB upload in Nagios XI

- Page: https://www.vulneraibility.com/cve/CVE-2026-119742
- CVSS: 8.6
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 4.09% (percentile 90.8)
- CISA SSVC: exploitation none, automatable no, technical impact total (assessed 2026-11-03)
- Weakness: CWE-78
- Published: 2026-11-03

## Affected versions

- Nagios Enterprises, LLC Nagios XI: affected < 2026R2

A version outside these ranges is not a statement that it is unaffected.

## Impact

Authenticated admin can execute arbitrary OS commands as the web-server user via crafted MIB filename, enabling code execution and pivoting.

## Action

Immediate action required

## Recommendation

Upgrade Nagios XI to 2026R2 immediately; if unable, disable MIB uploads and restrict admin access.

## References

- [patch] https://www.nagios.com/security-disclosures/nagios-xi/2026r2/
- [advisory] https://www.vulncheck.com/advisories/nagios-xi-2026r2-os-command-injection-via-mibs-php

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.