Vulnerability · Published Jan 27, 2026 · Assigned by VulnCheck
CVE-2020-36941Knockpy 4.1.1 - CSV Injection
Critical 9.8
In plain English
A critical-severity security flaw in knock from guelfoweb. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.6%top 51.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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 (as reported)
Weakness: CWE-1236 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- ExploitDB-49342 exploit
- Knockpy GitHub Repository product
- VulnCheck Advisory: Knockpy 4.1.1 - CSV Injection third-party-advisory