CVE-2021-47837

5.1 mediumEPSS 0.4%

Medium (5.1). EPSS 0.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

5.1 medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

CVSS 3.1

7.2 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 38% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-01-16
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

https://github.com/amitmerchant1990/electron-markdownify
https://imgur.com/a/T4jBoiS
https://www.exploit-db.com/exploits/49835
https://www.vulncheck.com/advisories/markdownify-persistent-cross-site-scripting
https://www.vulncheck.com/advisories/markdownify-persistent-cross-site-scripting

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