GHSA-jq6g-4v5m-wm9r Information Disclosure due to Out-of-scope Site Resolution

• Packagist typo3/cms-core: >= 9.4.0, < 9.5.42 → fixed in 9.5.42 • Packagist typo3/cms-core: >= 10.0.0, < 10.4.39 → fixed in 10.4.39 • Packagist typo3/cms-core: >= 11.0.0, < 11.5.30 → fixed in 11.5.30 • Packagist typo3/cms-core: >= 12.0.0, < 12.4.4 → fixed in 12.4.4

> ### CVSS: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:F/RL:O/RC:C` (3.5) Problem In multi-site scenarios, enumerating the HTTP query parameters `id` and `L` allowed out-of-scope access to rendered content in the website frontend. For instance, this allowed visitors to access content of an internal site by adding handcrafted query parameters to the URL of a site that was publicly available. Solution Update to TYPO3 versions 9.5.42 ELTS, 10.4.39 ELTS, 11.5.30, 12.4.4 that fix the problem described above. > ℹ️ Strong security defaults - Manual actions required > Resolving sites by the `id` and `L` HTTP query parameters is now denied per default. However, it is still allowed to resolve a particular page by e.g. `https://example.org/?id=123&L=0` - as long as the `page-id 123` is in the scope of the site configured for the `base-url example.org`. > The new feature flag `security.frontend.allowInsecureSiteResolutionByQueryParameters` - which is disabled per default - can be used to reactivate the previous behavior. Credits Thanks to Garvin Hicking who reported this issue, and to TYPO3 core & security team members Oliver Hader and Benjamin Franzke who fixed the issue. References • TYPO3-CORE-SA-2023-003