Vulnerability · Published Jan 16, 2026 · Assigned by VulnCheck
CVE-2021-47836Markdown Explorer 0.1.1 - Persistent Cross-Site Scripting
Medium 6.1
In plain English
A medium-severity cross-site scripting in Markdown Explorer from jersou. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).
Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.3%top 71.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
Markdown Explorer 0.1.1 contains a cross-site scripting vulnerability that allows attackers to inject malicious code through file uploads and editor inputs. Attackers can upload markdown files with embedded JavaScript payloads that execute in the application's privileged renderer context, allowing code execution on the host.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| jersou | Markdown Explorer | 0.1.1 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References
- ExploitDB-49826 exploit
- Markdown Explorer GitHub Repository product
- Proof of Concept Video exploit
- VulnCheck Advisory: Markdown Explorer 0.1.1 - Persistent Cross-Site Scripting third-party-advisory