CVE-2026-9154
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedArbitrary File Write vulnerability in Rapid7 InsightConnect Sed Plugin on Linux allows authenticated attackers to write attacker-controlled content to arbitrary file paths via the expression parameter.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceArbitrary File Write vulnerability in the Rapid7 InsightConnect Sed Plugin on Linux allows authenticated attackers to write attacker-controlled content to arbitrary file paths by manipulating the expression parameter, potentially leading to code execution or system compromise.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 4.2.2CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
-
Identify the Linux environmentVerify the operating system is Linux by running 'uname -a' or checking /etc/os-releaseAffected if The system is not Linux, the vulnerability does not apply
-
Confirm Rapid7 InsightConnect Sed Plugin presenceSearch for the InsightConnect Sed Plugin installation directory, typically found in /opt/rapid7/insightconnect or similar plugin directories; check with 'find /opt -name '*sed*' 2>/dev/null'Affected if The Rapid7 InsightConnect Sed Plugin is not installed, this specific attack surface does not exist
-
Verify Gnu Sed version 4.2.2Run 'sed --version' to check the installed Gnu Sed versionAffected if Gnu Sed version 4.2.2 is the exact version present on the system
-
Check plugin configuration and permissionsInspect the InsightConnect Sed Plugin configuration file for permissions and any file path restrictions; look for config files in the plugin directoryAffected if The plugin configuration allows unrestricted file write paths through the expression parameter
-
Review access controls on the expression parameterExamine the plugin or automation workflow configuration that invokes sed to see if the expression parameter is user-controlled or accepts external inputAffected if The expression parameter accepts unvalidated or unsanitized external input that can include path traversal sequences
A user is affected if running Linux with Rapid7 InsightConnect Sed Plugin that uses Gnu Sed 4.2.2 and allows unvalidated expression parameter input that can write to arbitrary file paths.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataImplement strict input validation and path sanitization on the expression parameter to prevent path traversal and restrict write operations to intended directories; also apply principle of least privilege to plugin permissions.
- Consultation3.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-9154 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-9154 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data