Marp Core allows XSS by improper neutralization of HTML sanitization
Marp Core (@marp-team/marp-core) from v3.0.2 to v3.9.0 and v4.0.0, are vulnerable to cross-site scripting (XSS) due to improper neutralization of HTML sanitization.
Impact
Marp Core includes an HTML sanitizer with allowlist support. In the affected versions, the built-in allowlist is enabled by default. When the allowlist is active, if insufficient HTML comments are included, the sanitizer may fail to properly sanitize HTML content and lead cross-site scripting (XSS).
Patches
Marp Core v3.9.1 and v4.0.1 have been patched to fix that.
Workarounds
If you are unable to update the package immediately, disable all HTML tags by setting html: false option in the Marp class constructor.
const marp = new Marp({ html: false })References
- CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- https://github.com/marp-team/marp-core/pull/282
- https://github.com/marp-team/marp-core/commit/61a1def244d1b6faa8e2c0be97ec0b68cab3ab49
Credits
Thanks to @Ry0taK for finding out this vulnerability.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @marp-team/marp-core | >= 3.0.2, < 3.9.1, >= 4.0.0, < 4.0.1 | 3.9.1, 4.0.1 |
References
- https://github.com/marp-team/marp-core/security/advisories/GHSA-x52f-h5g4-8qv5
- https://nvd.nist.gov/vuln/detail/CVE-2024-56510
- https://github.com/marp-team/marp-core/pull/282
- https://github.com/marp-team/marp-core/commit/61a1def244d1b6faa8e2c0be97ec0b68cab3ab49
- https://github.com/marp-team/marp-core
- https://github.com/marp-team/marp-core/releases/tag/v3.9.1
- https://github.com/marp-team/marp-core/releases/tag/v4.0.1
- CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L- Weakness (CWE)
CWE-79- Platform
- npm
- Package
@marp-team/marp-core- Disclosed
- 26.12.2024
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-x52f-h5g4-8qv5 - CC BY 4.0
Vulnerability history: @marp-team/marp-core
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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