CVE-2020-36941

CRITICAL 9.8

Knockpy 4.1.1 - CSV Injection

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-1236
Vendor	guelfoweb
Product	knock
Published	Jan 27, 2026
Last Updated	Mar 5, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

guelfoweb / knock

4.1.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

exploit-db.com: https://www.exploit-db.com/exploits/49342 github.com: https://github.com/guelfoweb/knock vulncheck.com: https://www.vulncheck.com/advisories/knockpy-csv-injection

Credits

Dolev Farhi