CVE-2026-48761: HtmlSanitizer UrlAttributeSanitizer Misses URL Attributes on <object>, <applet>, <iframe>, <img> and the URL Inside <meta http-equiv="refresh"> content

More info at https://symfony.com/cve-2026-48761...

CVE-2026-45753: HtmlSanitizer UrlAttributeSanitizer Omits action/formaction/poster/cite: javascript: URI Survives Sanitization (XSS)

More info at https://symfony.com/cve-2026-45753...

CVE-2026-48761: HtmlSanitizer UrlAttributeSanitizer Misses URL Attributes on <object>, <applet>, <iframe>, <img> and the URL Inside <meta http-equiv="refresh"> content

More info at https://symfony.com/cve-2026-48761...

Cross-Site Scripting

I've picked up on the work started over at https://github.com/erusev/parsedown/pull/276 and rebased on erusev/master. Since this is rebased on master, I can't point at PR at naNuke/master without running into the merge conflicts that I've already resolved manually. I've implemented what I suggest...