Description
When Microsoft Excel imports a CSV file, it executes cells beginning with certain characters as formulas, giving such CSV files arbitrary execution. 

Velociraptor fails to sanitize such cells when exporting to CSV from various places such as the GUI, offline collector or data exports.

It is not clear if the vulnerability is actually in Microsoft Excel treating a CSV data file as executable content, or if Velociraptor should be sanitizing the data to prevent Excel from executing it. However, since this is such a common use case for Velociraptor we decided to highlight it in an advisory.
Published: 2026-08-12
Score: 6.1 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

Velociraptor fails to sanitize cells that begin with certain characters when exporting CSV files. When a victim opens such a CSV in Microsoft Excel, Excel interprets those cells as formulas and executes them, allowing an attacker to run arbitrary code. The weakness is a formula injection flaw documented as CWE‑1236, and it can compromise confidentiality, integrity, and availability of the affected system.

Affected Systems

The vulnerability affects Rapid7 Velociraptor, a monitoring and forensic tool. No specific product versions are listed in the advisory, so any release that exports CSV data via the GUI, offline collector, or data export mechanisms is potentially impacted.

Risk and Exploitability

The CVSS score of 6.1 indicates a medium severity vulnerability, and the EPSS score is currently unavailable, suggesting that the exploit probability is not quantified. The issue is not listed in the CISA KEV catalog, but because it relies on the common behavior of Excel, attackers could target users who regularly open exported CSV reports. The likely attack vector is a social‑engineering scenario where an attacker sends a malicious CSV file to an end‑user who opens it in Excel or Google Docs.

Generated by OpenCVE AI on August 12, 2026 at 12:12 UTC.

Remediation

Vendor Workaround

Never open exported CSV files using Microsoft Excel or Google Docs. Libreoffice was tested to not be vulnerable to this issue so it can be used safely.


OpenCVE Recommended Actions

  • Do not open Velociraptor‑exported CSV files with Microsoft Excel or Google Docs; use LibreOffice instead.
  • If an updated version of Velociraptor that sanitizes exported CSV content is available, apply it promptly.
  • Implement an internal review of export pipelines to sanitize or remove formula‑starting cells before exporting, or restrict exported CSV usage to trusted environments.

Generated by OpenCVE AI on August 12, 2026 at 12:12 UTC.

Tracking

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Advisories

No advisories yet.

History

Wed, 12 Aug 2026 17:30:00 +0000

Type Values Removed Values Added
First Time appeared Rapid7
Rapid7 velociraptor
Vendors & Products Rapid7
Rapid7 velociraptor

Wed, 12 Aug 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 12 Aug 2026 10:15:00 +0000

Type Values Removed Values Added
Description When Microsoft Excel imports a CSV file, it executes cells beginning with certain characters as formulas, giving such CSV files arbitrary execution.  Velociraptor fails to sanitize such cells when exporting to CSV from various places such as the GUI, offline collector or data exports. It is not clear if the vulnerability is actually in Microsoft Excel treating a CSV data file as executable content, or if Velociraptor should be sanitizing the data to prevent Excel from executing it. However, since this is such a common use case for Velociraptor we decided to highlight it in an advisory.
Title Velociraptor CSV Formula Injection in Export Pipeline
Weaknesses CWE-1236
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N'}


Subscriptions

Rapid7 Velociraptor
cve-icon MITRE

Status: PUBLISHED

Assigner: rapid7

Published:

Updated: 2026-08-12T12:29:40.570Z

Reserved: 2026-07-21T08:32:47.510Z

Link: CVE-2026-64955

cve-icon Vulnrichment

Updated: 2026-08-12T12:29:23.764Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-12T10:17:20.310

Modified: 2026-08-28T21:17:10.720

Link: CVE-2026-64955

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-12T17:15:03Z

Weaknesses
  • CWE-1236

    Improper Neutralization of Formula Elements in a CSV File