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

Quick assessment

Affected
nuxt-modules mdc
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nuxt MDC是Nuxt开源的一个应用程序，增强了常规 Markdown 的能力。 Nuxt MDC存在跨站脚本漏洞，该漏洞源于对Markdown中URL的解析逻辑不安全，导致任意JavaScript代码执行。

CVSS 9.3 · Critical EPSS 0.68% · P52
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I. Basic Information for CVE-2025-24981

Vulnerability Information
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Vulnerability Title
Parsed HTML anchor links in Markdown provided to parseMarkdown can result in XSS in @nuxtjs/mdc
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Nuxt MDC 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nuxt MDC是Nuxt开源的一个应用程序，增强了常规 Markdown 的能力。 Nuxt MDC存在跨站脚本漏洞，该漏洞源于对Markdown中URL的解析逻辑不安全，导致任意JavaScript代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
nuxt-modules mdc < 0.13.3 -

II. Public POCs for CVE-2025-24981

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claude_code · 6055 chars
GitHub 复现环境（可 clone 直接跑）
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III. Intelligence Information for CVE-2025-24981

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Patches & Fixes for CVE-2025-24981 (1)

Vendor Advisories for CVE-2025-24981 (1)

Other References for CVE-2025-24981 (1)

IV. Related Vulnerabilities

Same product: mdc
Same vendor: nuxt-modules
Same weakness: CWE-79

V. Comments for CVE-2025-24981

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