CVE-2021-47839
Marky 0.0.1 - Persistent Cross-Site Scripting
- State
- Published
- Severity
- 5.1 Medium
- Published
- Jan 16, 2026
- Updated
- Jul 15, 2026
- Reserved
- Jan 14, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | 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 | VulnCheck |
| 3.1 | 7.2 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
Markyvesparny |
|
References
- ExploitDB-49831exploit
- Marky GitHub Repositoryproduct
- Proof of Concept Videoexploit
- VulnCheck Advisory: Marky 0.0.1 - Persistent Cross-Site Scriptingthird-party-advisory
- https://access.redhat.com/security/cve/CVE-2021-47839vdb-entry
- RHBZ#2430451issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47839.json
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