Vulnerability · Published Jan 16, 2026 · Assigned by VulnCheck
CVE-2021-47838Markright 1.0 - Persistent Cross-Site Scripting
High 7.2
In plain English
A high-severity cross-site scripting in Markright from dvcrn. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities).
Severity (CVSS 3.1)7.2High
Exploit odds (30 days)0.4%top 61.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
References
- ExploitDB-49834 exploit
- Markright GitHub Repository product
- Proof of Concept Video exploit
- VulnCheck Advisory: Markright 1.0 - Persistent Cross-Site Scripting third-party-advisory