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PatchSiren cyber security CVE debrief

CVE-2026-9153 Rapid7 CVE debrief

CVE-2026-9153 is an Arbitrary File Read vulnerability in Rapid7 InsightConnect Sed Plugin on Linux. Authenticated attackers can read arbitrary files via the expression parameter due to insufficient input validation. The CVSS score is 6.5, and the severity is MEDIUM. This vulnerability allows attackers to access sensitive information, potentially leading to further exploitation. Defenders should assess their exposure and prioritize verification and remediation efforts. The vulnerability is caused by a lack of proper input validation in the Sed Plugin, which enables attackers to manipulate the expression parameter and read files outside the intended directory.

Vendor
Rapid7
Product
InsightConnect Sed Plugin
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-25
Original CVE updated
2026-10-25
Advisory published
2026-06-25
Advisory updated
2026-10-25

Who should care

Defenders responsible for Linux environments with the Rapid7 InsightConnect Sed Plugin installed should assess exposure and prioritize verification and remediation.

Why it matters

CVE-2026-9153 is a MEDIUM-severity vulnerability in Rapid7 InsightConnect Sed Plugin on Linux, allowing authenticated attackers to read arbitrary files. Defenders should prioritize verification, remediation, and monitoring.

  • Verify vulnerability in Linux environments with Rapid7 InsightConnect Sed Plugin installed
  • Ensure Sed Plugin is up-to-date to prevent exploitation
  • Monitor for potential exploitation attempts to detect possible attacks

Technical summary

The vulnerability is caused by insufficient input validation in the expression parameter of the Rapid7 InsightConnect Sed Plugin on Linux. This allows authenticated attackers to read arbitrary files. The plugin does not properly sanitize user input, enabling attackers to bypass restrictions and access sensitive files. The vulnerability has a CVSS score of 6.5 and is classified as MEDIUM severity. To exploit this vulnerability, attackers need to be authenticated and have access to the expression parameter.

Defensive priority

Defenders should prioritize verifying the vulnerability in their Linux environments and ensuring that the Sed Plugin is up-to-date.

Recommended defensive actions

  • Verify the vulnerability in your Linux environments
  • Ensure that the Sed Plugin is up-to-date
  • Monitor for potential exploitation attempts

Evidence notes

The vulnerability is described in the CVE record and NVD vulnerability detail page. The source-provided CVE metadata and vendor advisory are available for further information.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-9153 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-9153

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-9153 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-9153

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.