# CVE-2024-56510: Marp Core allows XSS by improper neutralization of HTML sanitization

> An attacker can execute arbitrary scripts via improper HTML sanitization in Marp Core, affecting users rendering untrusted Markdown presentations.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 26 Dec 2024
- **Updated:** 27 Dec 2024
- **Also known as:** GHSA-x52f-h5g4-8qv5

## What is CVE-2024-56510?

CVE-2024-56510 is a medium-severity cross-site scripting vulnerability in marp-team marp-core, published on 26 Dec 2024. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

@marp-team/marp-core is the core for Marp, which is the ecosystem to write your presentation with plain Markdown. 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. Marp Core v3.9.1 and v4.0.1 have been patched to fix that. If you are unable to update the package immediately, disable all HTML tags by setting html: false option in the Marp class constructor.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2024-56510?

4 open source packages ship an affected version, including @marp-team/marp-core.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `@marp-team/marp-core` | npm | From 3.0.2 | 3.9.1 |
| `@marp-team/marp-core` | npm | From 3.0.2 | 3.9.1 |
| `@marp-team/marp-core` | npm | From 4.0.0 | 4.0.1 |
| `@marp-team/marp-core` | npm | From 4.0.0 | 4.0.1 |

## How do I fix CVE-2024-56510?

Upgrade @marp-team/marp-core to a fixed version for your release line: 3.9.1 or 4.0.1.

## Is CVE-2024-56510 being exploited?

There is no known exploitation of CVE-2024-56510 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-56510 and fix it if it is affected.

What it is: CVE-2024-56510 is a medium-severity cross-site scripting vulnerability in marp-team marp-core, published on 26 Dec 2024. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2024-56510 in the wild and no public exploit code.

Affected packages and fixed versions:
- @marp-team/marp-core (npm): affected from 3.0.2; fixed in 3.9.1
- @marp-team/marp-core (npm): affected from 3.0.2; fixed in 3.9.1
- @marp-team/marp-core (npm): affected from 4.0.0; fixed in 4.0.1
- @marp-team/marp-core (npm): affected from 4.0.0; fixed in 4.0.1

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2024-56510/ (Markdown: https://insights.sbomify.com/CVE-2024-56510/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-56510
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-56510
- OSV: https://osv.dev/vulnerability/CVE-2024-56510

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-56510/
Summaries are generated and may contain mistakes; the official description above is the record.