CVE-2025-66400 – mdast-util-to-hast unsanitized class attribute

CVE ID : CVE-2025-66400

Published : Dec. 1, 2025, 11:15 p.m. | 1 hour, 9 minutes ago

Description : mdast-util-to-hast is an mdast utility to transform to hast. From 13.0.0 to before 13.2.1, 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. This vulnerability is fixed in 13.2.1.

Severity: 6.9 | MEDIUM

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