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Description

Markright 1.0 contains a persistent cross-site scripting vulnerability that allows attackers to embed malicious payloads in markdown files. Attackers can upload specially crafted markdown files that execute arbitrary JavaScript when opened, potentially enabling remote code execution on the victim's system.

PUBLISHED Reserved 2026-01-14 | Published 2026-01-16 | Updated 2026-01-16 | Assigner VulnCheck




MEDIUM: 5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
HIGH: 7.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Problem types

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

1.0
affected

Credits

TaurusOmar finder

References

www.vulncheck.com/...rkright-persistent-cross-site-scripting exploit

www.exploit-db.com/exploits/49834 (ExploitDB-49834) exploit

github.com/dvcrn/markright (Markright GitHub Repository) product

imgur.com/a/VOsgKbZ (Proof of Concept Video) exploit

www.vulncheck.com/...rkright-persistent-cross-site-scripting (VulnCheck Advisory: Markright 1.0 - Persistent Cross-Site Scripting) third-party-advisory

cve.org (CVE-2021-47838)

nvd.nist.gov (CVE-2021-47838)

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