{"id":"CVE-2021-47839","title":"Marky 0.0.1 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts into markdown files","summary":"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 t…","severity":"high","cvss":7.2,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","cwe":["CWE-79","CWE-79"],"published":"2026-01-16","updated":"2026-06-30","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-47839","references":[{"url":"https://github.com/vesparny/marky","label":"disclosure@vulncheck.com"},{"url":"https://imgur.com/a/qclfrUx","label":"disclosure@vulncheck.com"},{"url":"https://www.exploit-db.com/exploits/49831","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/marky-persistent-cross-site-scripting","label":"disclosure@vulncheck.com"},{"url":"https://access.redhat.com/security/cve/CVE-2021-47839","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2430451","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47839.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.vulncheck.com/advisories/marky-persistent-cross-site-scripting","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00471,"epssPercentile":0.39907,"ingestedAt":"2026-06-30T13:26:50.499Z","slug":"CVE-2021-47839","body":"## Overview\n\nMarky 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":39.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}