getgrav/grav 2.0.15 on GitHub

Bugfix

A plugin's blueprints can use the data providers that plugin ships again, instead of having every one of them refused by a check that only recognised the providers core itself registers (getgrav/grav-plugin-email#193). Fields defined in page frontmatter are held to the stricter rule instead, which is where the risk actually was.
[security] A configuration admin can no longer reach an unvetted built-in routine by writing a blueprint field's data provider as a plain function name, a spelling that was still being checked against a list of known-bad names rather than the list of approved ones (GHSA-f8wv-xp27-6gq7).
[security] The content security scan now reads an unpaired quote inside an unquoted attribute value the way a browser does, closing another way a page editor could hide a script from it (GHSA-vfmf-q6x9-cw96).
[security] The media URL in an audio or video tag is now escaped, so a filename carrying markup can no longer add its own attributes to the player (GHSA-6qw9-4vv5-jr97).
JSON responses no longer fail outright when the data contains invalid UTF-8. json_encode() returns false on malformed bytes, and the PSR-7 response body is type-hinted string|resource|StreamInterface, so that false came back out as an unhandled TypeError from inside the vendor stream rather than as a response. Bad bytes are now substituted, and the remaining structural failures raise a catchable JsonException instead of a silent false. Output for valid data is unchanged.
[security] The fast static asset server now keeps a request inside the directory the site published, instead of also allowing any neighbouring directory whose name starts with the same letters (GHSA-4v9q-p283-qc2m).
[security] File uploads now reject a few more extensions that browsers run script from, or that a server may hand to PHP: xhtml, xht, svgz, php7, php8, pht, phtm and phps (GHSA-66xf-ggf4-6hmc).
[security] The bundled Caddyfile protections did nothing. They were written as nginx-style regexes, which Caddy reads as literal paths that never match, and the respond they redirected to ran after the catch-all rewrite had already claimed the request. The rules are now named path_regexp matchers answering 403 directly, inside a route block so they run before the rewrite.