XSS in Jersou Markdown Explorer
CVE-2021-47836
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (27.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000
Affected products
- Jersou Markdown Explorer — versions 0.1.1
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/49826 (exploit)
- github.com/jersou/markdown-explorer (product)
- imgur.com/a/w4bcPWs (exploit)
- www.vulncheck.com/advisories/markdown-explorer-persistent-cross-site-scripting (third-party-advisory)
Frequently asked questions
- What is CVE-2021-47836?
- CVE-2021-47836 is a medium-severity vulnerability in Jersou Markdown Explorer, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-01-16.
- How severe is CVE-2021-47836?
- Medium severity. CVSS v3 base score is 6.1 out of 10.