Cross-Site Scripting in simple-markdown
Versions of simple-markdown prior to 0.4.4 are vulnerable to Cross-Site Scripting. Due to insufficient input sanitization the package may render output containing malicious JavaScript. This vulnerability can be exploited through input of links containing data or VBScript URIs and a base64-encoded payload.
Recommendation
Upgrade to version 0.4.4 or later.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | simple-markdown | < 0.4.4 | 0.4.4 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2019-9844
- https://github.com/Khan/simple-markdown/pull/63
- https://github.com/Khan/simple-markdown
- https://github.com/advisories/GHSA-qj3f-9gmq-fwv5
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JFLP3KJVSV5VWMNEBRXLGRVYFXOV5KOG
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KZG2I7VH7WLSEUQ77KYP5CRAVFT2RK2U
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/O5EFW655O3BXZYAPB65XEREXB2DSNSOT
- https://www.npmjs.com/advisories/815
- https://www.npmjs.com/package/simple-markdown/v/0.4.4
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- npm
- Package
simple-markdown- Disclosed
- 09.04.2019
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-qj3f-9gmq-fwv5 - CC BY 4.0
Vulnerability history: simple-markdown
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 04.2019 02.2023
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
- Medium 1
Disclosures per year
- 2019: 1
- 2020: 0
- 2021: 0
- 2022: 0
- 2023: 2
- 2024: 0
- 2025: 0
- 2026: 0
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Cross-Site Scripting in simple-markdown this entry
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