CVE-2026-54743 Lemmy: Stored XSS via markdown image alt-text in lemmy-ui html5-embed

Lemmy is a link aggregator and forum for the fediverse. Prior to lemmy-ui 0.19.19-beta.1, LemmyNet/lemmy-ui renders Markdown in src/shared/markdown.ts for post bodies, comment bodies, private messages, and community and site sidebars through mdToHtml, which returns a raw html object that Inferno...