CVE-2026-9155Network attack vector

Authenticated command execution via denylist bypass

Published Jun 25, 2026 · Updated Jun 25, 2026

OS command injection in Rapid7 InsightConnect Sed Plugin before 2.0.5 allows remote authenticated users to execute arbitrary commands. The Process String and Process Bytes actions accept an expression whose command validation used a denylist, allowing disallowed sed behavior that the replacement allowlist rejects. An authenticated InsightConnect user who can supply an expression can run commands with the Linux plugin container's privileges, affecting its data and availability.

CVSS severity8.8
High
EPSS probability1.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Rapid7 InsightConnect Sed Plugin before 2.0.5 allows remote authenticated users to execute arbitrary commands. The Process String and Process Bytes actions accept an expression whose command validation used a denylist, allowing disallowed sed behavior that the replacement allowlist rejects. An authenticated InsightConnect user who can supply an expression can run commands with the Linux plugin container's privileges, affecting its data and availability.

The record

CVE
CVE-2026-9155
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
Rapid7
Product
Sed
Classifications
CWE-78, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Rapid7 · Sedversion=0 <2.0.5

Published CVSS scores

8.8Rapid7, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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