What’s Vulnerable › Vulnerabilities

CVE-2021-47839: Marky 0.0.1 - Persistent Cross-Site Scripting

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-16 · updated 2026-07-15
• Weakness: CWE-79

Description

Marky 0.0.1 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts into markdown files. Attackers can upload crafted markdown files with embedded JavaScript payloads that execute when the file is opened, potentially enabling remote code execution.

Affected products

• vesparny Marky: 0.0.1

References

• https://github.com/vesparny/marky
• https://imgur.com/a/qclfrUx
• https://www.exploit-db.com/exploits/49831
• https://www.vulncheck.com/advisories/marky-persistent-cross-site-scripting
• https://access.redhat.com/security/cve/CVE-2021-47839
• https://bugzilla.redhat.com/show_bug.cgi?id=2430451
• https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47839.json
• https://www.vulncheck.com/advisories/marky-persistent-cross-site-scripting

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