GHSA-MJ46-R4GR-5X83 Unsanitized JavaScript code injection possible in gatsby-plugin-mdx

Impact The gatsby-plugin-mdx plugin prior to versions 3.15.2 and 2.14.1 passes input through to the gray-matter npm package, which is vulnerable to JavaScript injection in its default configuration, unless input is sanitized. The vulnerability is present when passing input in both webpack MDX fil...