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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact Low

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation poc

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Vesparny
  • Marky

No data.

No data.

References
Link Providers
https://github.com/vesparny/marky cve-icon cve-icon cve-icon
https://imgur.com/a/qclfrUx cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2021-47839 cve-icon
https://www.cve.org/CVERecord?id=CVE-2021-47839 cve-icon
https://www.exploit-db.com/exploits/49831 cve-icon cve-icon cve-icon
https://www.vulncheck.com/advisories/marky-persistent-cross-site-scripting cve-icon cve-icon cve-icon cve-icon
History

Mon, 19 Jan 2026 09:45:00 +0000

Type Values Removed Values Added
First Time appeared Vesparny
Vesparny marky
Vendors & Products Vesparny
Vesparny marky

Sat, 17 Jan 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 threat_severity

Important

Fri, 16 Jan 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 16 Jan 2026 19:15:00 +0000

Type Values Removed Values Added
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.
Title Marky 0.0.1 - Persistent Cross-Site Scripting
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'}

cvssV4_0

{'score': 5.1, 'vector': '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'}
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-01-16T21:09:40.977Z

Reserved: 2026-01-14T17:11:19.901Z

Link: CVE-2021-47839

cve-icon Vulnrichment

Updated: 2026-01-16T21:00:20.315Z

cve-icon NVD

Status : Received

Published: 2026-01-16T19:16:09.537

Modified: 2026-01-16T22:16:17.330

Link: CVE-2021-47839

cve-icon Redhat

Severity : Important

Publid Date: 2026-01-16T19:09:37Z

Links: CVE-2021-47839 - Bugzilla