major vulnerability· requires attention

Authenticated OS command injection in widely used enterprise monitoring (Nagios XI) can compromise monitoring infrastructure and enable lateral movement; vendor released a fix.

Applications

CVE-2026-119742

8.6

High

EPSS 4%Patch available

Authenticated admin OS command injection via MIB upload in Nagios XI

exploited

No known exploitation not in CISA KEV as of our last sync

fix

Patch available see the advisory in the references

likelihood

EPSS 4.1%top 10% of scored CVEs

Published 3 Nov 2026Analysed here 5 Nov 2026CVSS scored by the publisher (CNA)

common questions

Is CVE-2026-119742 being exploited?

Not confirmed. CVE-2026-119742 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 4.1% probability of exploitation in the next 30 days.

How severe is CVE-2026-119742?

CVE-2026-119742 is rated High with a CVSS score of 8.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2026-119742?

Yes. A fix has been recorded for CVE-2026-119742. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-119742 affect?

CVE-2026-119742 affects Nagios XI prior to 2026R2. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2026-119742?

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

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary

technical analysis

affected

Nagios XI prior to 2026R2

impact

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

action required

Immediate action required

affected versions

Nagios Enterprises, LLC Nagios XI

affected< 2026R2

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

cisa ssvc

exploitation: none
automatable: no
technical impact: total

Assessed by CISA 3 Nov 2026 (SSVC 2.0.3).

timeline

3 Nov 2026Published
3 Nov 2026CISA SSVC assessment: exploitation none · same day later
3 Nov 2026CVE record last updated · same day later
5 Nov 2026Analysed by vulneraibility.com · 2 days later

how to fix

Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.

references

NVD CVE.org CVE Details Source

2 references in the CVE record: 1 advisory, 1 patch

Advisoryvulncheck.com /advisories/nagios-xi-2026r2-os-command-injection-via-mibs-php
Patchnagios.com /security-disclosures/nagios-xi/2026r2/

sources

CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
NVD: CVSS and CPE data
CISA Vulnrichment (ADP): SSVC decision points
FIRST EPSS: exploit probability and percentile
Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.

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