CVE-2021-23654: Improper Input Validation

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-11-26 · updated 2026-06-17
Weakness: CWE-1236

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.

Affected products

html-to-csv: through 0.1.3

References

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

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