CVE-2020-36941: Guelfoweb Knockpy

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

Knockpy 4.1.1 contains a CSV injection vulnerability that allows attackers to inject malicious formulas into CSV reports through unfiltered server headers. Attackers can manipulate server response headers to include spreadsheet formulas that will execute when the CSV is opened in spreadsheet applications.

Affected products

• Guelfoweb Knockpy: version 4.1.1 only

Published 2026-01-27. Last modified 2026-06-17.