How severe is CVE-2026-8666?

CVE-2026-8666 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability low.

Is CVE-2026-8666 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-8666?

CVE-2026-8666 affects Rapid7 Insightconnect Traceroute. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-8666?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-8666 have an EU (EUVD) identifier?

Yes. CVE-2026-8666 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39161.

When was CVE-2026-8666 published?

CVE-2026-8666 was published on 2026-06-25 and last updated on 2026-06-29.

CVE-2026-8666

CVE-2026-8666 is a high-severity vulnerability in Rapid7 Insightconnect Traceroute with a CVSS 3.x base score of 7.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 7.7)
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39161
Weakness: CWE-78
Affected product: Rapid7 Insightconnect Traceroute
Published: 2026-06-25
Last modified: 2026-06-29

Description

OS Command Injection vulnerability in the traceroute action of Rapid7 InsightConnect Traceroute Plugin on Linux allows remote attackers to execute arbitrary OS commands via the host, port, max_ttl, count, or time_out request parameters due to insufficient input validation when constructing shell commands.

Frequently asked questions

What is CVE-2026-8666?: OS Command Injection vulnerability in the traceroute action of Rapid7 InsightConnect Traceroute Plugin on Linux allows remote attackers to execute arbitrary OS commands via the host, port, max_ttl, count, or time_out request parameters due to insufficient input validation when constructing shell commands.
How severe is CVE-2026-8666?: CVE-2026-8666 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability low.
Is CVE-2026-8666 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-8666?: CVE-2026-8666 affects Rapid7 Insightconnect Traceroute. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-8666?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-8666 have an EU (EUVD) identifier?: Yes. CVE-2026-8666 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39161.
When was CVE-2026-8666 published?: CVE-2026-8666 was published on 2026-06-25 and last updated on 2026-06-29.

References

https://extensions.rapid7.com/extension/traceroute

Affected products (1)

cpe:2.3:a:rapid7:insightconnect_traceroute:*:*:*:*:*:rapid7:*:*

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