What’s Vulnerable › Vulnerabilities

CVE-2020-36941: Knockpy 4.1.1 - CSV Injection

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-01-27 · updated 2026-06-17
• Weakness: CWE-1236

Description

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 knock: 4.1.1

References

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

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