CVE-2025-66400

A flaw was found in mdast-util-to-hast. This vulnerability allows rendered user supplied markdown Markdown code elements to appear like the rest of the page via character references. Mitigation Mitigation for this issue is either not available or the currently available options do not meet the Re...

Improper Input Sanitization

mdast-util-to-hast is vulnerable to Improper Input Sanitization. The vulnerability is due to the utility allowing multiple unprefixed classnames to be injected via character references in markdown, which allows an attacker to disguise malicious code elements so they appear as trusted parts of the...

GHSA-4FH9-H7WG-Q85M mdast-util-to-hast has unsanitized class attribute

Impact Multiple unprefixed classnames could be added in markdown source by using character references. This could make rendered user supplied markdown code elements appear like the rest of the page. The following markdown: markdown jsxss Would create If your page then applied .xss classes or...