GHSA-GX5W-RRHP-F436 XSS in mdBook

This is a cross-post of the official security advisoryml. The official post contains a signed version with our PGP key, as well. ml: https://groups.google.com/g/rustlang-security-announcements/c/3-sO6of29O0 The Rust Security Response Working Group was recently notified of a security issue affecti...