GHSA-x5qj-865h-mgvm

Symfony: HtmlSanitizer UrlAttributeSanitizer Misses URL Attributes

### Description `Symfony\Component\HtmlSanitizer\Visitor\AttributeSanitizer\UrlAttributeSanitizer::getSupportedAttributes()` enumerates the attribute names whose values are scrubbed through `UrlSanitizer::sanitize()` (scheme and host allow-lists, `javascript:` rejection, BiDi check, etc.). The list is `['src', 'href', 'lowsrc', 'background', 'ping', 'action', 'formaction', 'poster', 'cite']`. Other URL-bearing attributes are absent: `<object data=…>`, `<applet codebase=…>`, `<applet archive=…>` and `<object archive=…>`, `<iframe longdesc=…>` and `<img longdesc=…>`. When an integrator opts these elements/attributes in via `allowElement('object', ['data'])`, `allowElement('applet', ['codebase'])`, etc., or via `allowAttribute()`, no URL sanitization runs: `data="javascript:alert(1)"` and similar payloads ship through unchanged into the output, enabling stored XSS. `<meta http-equiv="refresh" content="0; url=…">` is the same class of bug routed differently: the URL is embedded inside a multi-field `content` attribute that the per-attribute sanitizer cannot detect from the attribute name alone. Integrators who enable `<meta>` with the `content` attribute (e.g. via `allowStaticElements()`) see `content="0; url=javascript:alert(1)"` pass through, producing a refresh-driven navigation to a `javascript:` URL. Default configurations are not affected: `<object>`, `<applet>` and `<iframe>` are not in `W3CReference::BODY_ELEMENTS` and `<meta>` requires an explicit opt-in to `<head>` context. The vulnerability surface is integrators who explicitly allow any of those elements together with the listed URL-bearing attributes. ### Resolution `UrlAttributeSanitizer` now also routes `data`, `codebase`, `archive` and `longdesc` through `UrlSanitizer::sanitize()`. A new `MetaRefreshAttributeSanitizer` registered as a default attribute sanitizer detects the `<delay>; url=<url>` syntax inside `<meta content>`, sanitizes the embedded URL, and drops the attribute if the URL is rejected; non-refresh meta `content` values are passed through unchanged. The patches for this issue are available [here](https://github.com/symfony/symfony/commit/069a70f9f26e61e9de3b7f9a864a86ed24b36bd0) for branch 6.4 (and forward-ported to 7.4, 8.0 and 8.1). ### Credits Symfony would like to thank Scott Arciszewski (Trail of Bits) for reporting the issue and Nicolas Grekas for providing the fix.