Critical 9.8Published Jan 27, 2026

CVE-2020-36941Knockpy 4.1.1 - CSV Injection

Updated under an hour ago (Oct 27, 2026, 1:00 AM ET)

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Every CVE for guelfoweb knock

Exploited in the last 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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-1236
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Mar 4, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

guelfoweb knock guelfoweb:knock (from the name)	4.1.1	CNA record
guelfoweb knockpy guelfoweb:knockpy	4.1.1	NVD

References

References

https://www.exploit-db.com/exploits/49342	exploit, third-party-advisory
https://github.com/guelfoweb/knock	product
https://www.vulncheck.com/advisories/knockpy-csv-injection	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.