What is CVE-2021-47837?

CVE-2021-47837 is a high-severity vulnerability in Amitmerchant1990 Markdownify, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-01-16.

How severe is CVE-2021-47837?

High severity. CVSS v3 base score is 7.2 out of 10.

XSS in Amitmerchant1990 Markdownify

CVE-2021-47837

Markdownify 1.2.0 contains a persistent cross-site scripting vulnerability that allows attackers to store malicious payloads within markdown files. Attackers can upload crafted markdown files with embedded scripts that execute when the file is opened, potentially enabling remote code execution.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.004 (34.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.

Affected products

Amitmerchant1990 Markdownify — versions 1.2.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2021-47837?: CVE-2021-47837 is a high-severity vulnerability in Amitmerchant1990 Markdownify, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-01-16.
How severe is CVE-2021-47837?: High severity. CVSS v3 base score is 7.2 out of 10.