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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/nuxt-modules/mdc/blob/main/src/runtime/parser/utils/props.ts#
- https://github.com/nuxt-modules/mdc/commit/99097738b5561639e9bf247c55d8103236618
- https://github.com/nuxt-modules/mdc/security/advisories/GHSA-j82m-pc2v-2484
FAQ
What is CVE-2025-24981?
CVE-2025-24981 is a vulnerability with a CVSS score of 9.3 (CRITICAL). 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 ...
How severe is CVE-2025-24981?
CVE-2025-24981 has been rated CRITICAL with a CVSS base score of 9.3/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2025-24981?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.